summaryrefslogtreecommitdiff
path: root/test/ruby/test_regexp.rb
blob: 85e78383b033ebe201c1cfe26a015ba29d570390 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
# coding: US-ASCII
# frozen_string_literal: false
require 'test/unit'

class TestRegexp < Test::Unit::TestCase
  def setup
    @verbose = $VERBOSE
    $VERBOSE = nil
  end

  def teardown
    $VERBOSE = @verbose
  end

  def test_has_NOENCODING
    assert Regexp::NOENCODING
    re = //n
    assert_equal Regexp::NOENCODING, re.options
  end

  def test_ruby_dev_999
    assert_match(/(?<=a).*b/, "aab")
    assert_match(/(?<=\u3042).*b/, "\u3042ab")
  end

  def test_ruby_core_27247
    assert_match(/(a){2}z/, "aaz")
  end

  def test_ruby_dev_24643
    assert_nothing_raised("[ruby-dev:24643]") {
      /(?:(?:[a]*[a])?b)*a*$/ =~ "aabaaca"
    }
  end

  def test_ruby_talk_116455
    assert_match(/^(\w{2,}).* ([A-Za-z\xa2\xc0-\xff]{2,}?)$/n, "Hallo Welt")
  end

  def test_ruby_dev_24887
    assert_equal("a".gsub(/a\Z/, ""), "")
  end

  def test_yoshidam_net_20041111_1
    s = "[\xC2\xA0-\xC3\xBE]"
    assert_match(Regexp.new(s, nil, "u"), "\xC3\xBE")
  end

  def test_yoshidam_net_20041111_2
    assert_raise(RegexpError) do
      s = "[\xFF-\xFF]".force_encoding("utf-8")
      Regexp.new(s, nil, "u")
    end
  end

  def test_ruby_dev_31309
    assert_equal('Ruby', 'Ruby'.sub(/[^a-z]/i, '-'))
  end

  def test_assert_normal_exit
    # moved from knownbug.  It caused core.
    Regexp.union("a", "a")
  end

  def test_to_s
    assert_equal '(?-mix:\x00)', Regexp.new("\0").to_s

    str = "abcd\u3042"
    [:UTF_16BE, :UTF_16LE, :UTF_32BE, :UTF_32LE].each do |es|
      enc = Encoding.const_get(es)
      rs = Regexp.new(str.encode(enc)).to_s
      assert_equal("(?-mix:abcd\u3042)".encode(enc), rs)
      assert_equal(enc, rs.encoding)
    end
  end

  def test_union
    assert_equal :ok, begin
      Regexp.union(
        "a",
        Regexp.new("\xc2\xa1".force_encoding("euc-jp")),
        Regexp.new("\xc2\xa1".force_encoding("utf-8")))
      :ng
    rescue ArgumentError
      :ok
    end
  end

  def test_word_boundary
    assert_match(/\u3042\b /, "\u3042 ")
    assert_not_match(/\u3042\ba/, "\u3042a")
  end

  def test_named_capture
    m = /&(?<foo>.*?);/.match("aaa &amp; yyy")
    assert_equal("amp", m["foo"])
    assert_equal("amp", m[:foo])
    assert_equal(5, m.begin(:foo))
    assert_equal(8, m.end(:foo))
    assert_equal([5,8], m.offset(:foo))

    assert_equal("aaa [amp] yyy",
      "aaa &amp; yyy".sub(/&(?<foo>.*?);/, '[\k<foo>]'))

    assert_equal('#<MatchData "&amp; y" foo:"amp">',
      /&(?<foo>.*?); (y)/.match("aaa &amp; yyy").inspect)
    assert_equal('#<MatchData "&amp; y" 1:"amp" 2:"y">',
      /&(.*?); (y)/.match("aaa &amp; yyy").inspect)
    assert_equal('#<MatchData "&amp; y" foo:"amp" bar:"y">',
      /&(?<foo>.*?); (?<bar>y)/.match("aaa &amp; yyy").inspect)
    assert_equal('#<MatchData "&amp; y" foo:"amp" foo:"y">',
      /&(?<foo>.*?); (?<foo>y)/.match("aaa &amp; yyy").inspect)

    /(?<_id>[A-Za-z_]+)/ =~ "!abc"
    assert_not_nil(Regexp.last_match)
    assert_equal("abc", Regexp.last_match(1))
    assert_equal("abc", Regexp.last_match(:_id))

    /a/ =~ "b" # doesn't match.
    assert_equal(nil, Regexp.last_match)
    assert_equal(nil, Regexp.last_match(1))
    assert_equal(nil, Regexp.last_match(:foo))

    bug11825_name = "\u{5b9d 77f3}"
    bug11825_str = "\u{30eb 30d3 30fc}"
    bug11825_re = /(?<#{bug11825_name}>)#{bug11825_str}/

    assert_equal(["foo", "bar"], /(?<foo>.)(?<bar>.)/.names)
    assert_equal(["foo"], /(?<foo>.)(?<foo>.)/.names)
    assert_equal([], /(.)(.)/.names)
    assert_equal([bug11825_name], bug11825_re.names)

    assert_equal(["foo", "bar"], /(?<foo>.)(?<bar>.)/.match("ab").names)
    assert_equal(["foo"], /(?<foo>.)(?<foo>.)/.match("ab").names)
    assert_equal([], /(.)(.)/.match("ab").names)
    assert_equal([bug11825_name], bug11825_re.match(bug11825_str).names)

    assert_equal({"foo"=>[1], "bar"=>[2]},
                 /(?<foo>.)(?<bar>.)/.named_captures)
    assert_equal({"foo"=>[1, 2]},
                 /(?<foo>.)(?<foo>.)/.named_captures)
    assert_equal({}, /(.)(.)/.named_captures)

    assert_equal("a[b]c", "abc".sub(/(?<x>[bc])/, "[\\k<x>]"))

    assert_equal("o", "foo"[/(?<bar>o)/, "bar"])
    assert_equal("o", "foo"[/(?<@bar>o)/, "@bar"])
    assert_equal("o", "foo"[/(?<@bar>.)\g<@bar>\k<@bar>/, "@bar"])

    s = "foo"
    s[/(?<bar>o)/, "bar"] = "baz"
    assert_equal("fbazo", s)
  end

  def test_named_capture_with_nul
    bug9902 = '[ruby-dev:48275] [Bug #9902]'

    m = /(?<a>.*)/.match("foo")
    assert_raise(IndexError, bug9902) {m["a\0foo"]}
    assert_raise(IndexError, bug9902) {m["a\0foo".to_sym]}

    m = Regexp.new("(?<foo\0bar>.*)").match("xxx")
    assert_raise(IndexError, bug9902) {m["foo"]}
    assert_raise(IndexError, bug9902) {m["foo".to_sym]}
    assert_nothing_raised(IndexError, bug9902) {
      assert_equal("xxx", m["foo\0bar"], bug9902)
      assert_equal("xxx", m["foo\0bar".to_sym], bug9902)
    }
  end

  def test_named_capture_nonascii
    bug9903 = '[ruby-dev:48278] [Bug #9903]'

    key = "\xb1\xb2".force_encoding(Encoding::EUC_JP)
    m = /(?<#{key}>.*)/.match("xxx")
    assert_equal("xxx", m[key])
    assert_raise(IndexError, bug9903) {m[key.dup.force_encoding(Encoding::Shift_JIS)]}
  end

  def test_match_data_named_captures
    assert_equal({'a' => '1', 'b' => '2', 'c' => nil}, /^(?<a>.)(?<b>.)(?<c>.)?/.match('12').named_captures)
    assert_equal({'a' => '1', 'b' => '2', 'c' => '3'}, /^(?<a>.)(?<b>.)(?<c>.)?/.match('123').named_captures)
    assert_equal({'a' => '1', 'b' => '2', 'c' => ''}, /^(?<a>.)(?<b>.)(?<c>.?)/.match('12').named_captures)

    assert_equal({'a' => 'x'}, /(?<a>x)|(?<a>y)/.match('x').named_captures)
    assert_equal({'a' => 'y'}, /(?<a>x)|(?<a>y)/.match('y').named_captures)

    assert_equal({'a' => '1', 'b' => '2'}, /^(.)(?<a>.)(?<b>.)/.match('012').named_captures)
    assert_equal({'a' => '2'}, /^(?<a>.)(?<a>.)/.match('12').named_captures)

    assert_equal({}, /^(.)/.match('123').named_captures)
  end

  def test_assign_named_capture
    assert_equal("a", eval('/(?<foo>.)/ =~ "a"; foo'))
    assert_equal(nil, eval('/(?<@foo>.)/ =~ "a"; defined?(@foo)'))
    assert_equal("a", eval('foo = 1; /(?<foo>.)/ =~ "a"; foo'))
    assert_equal("a", eval('1.times {|foo| /(?<foo>.)/ =~ "a"; break foo }'))
    assert_nothing_raised { eval('/(?<Foo>.)/ =~ "a"') }
    assert_nil(eval('/(?<Foo>.)/ =~ "a"; defined? Foo'))
  end

  def test_assign_named_capture_to_reserved_word
    /(?<nil>.)/ =~ "a"
    assert_not_include(local_variables, :nil, "[ruby-dev:32675]")
  end

  def test_match_regexp
    r = /./
    m = r.match("a")
    assert_equal(r, m.regexp)
    re = /foo/
    assert_equal(re, re.match("foo").regexp)
  end

  def test_source
    bug5484 = '[ruby-core:40364]'
    assert_equal('', //.source)
    assert_equal('\:', /\:/.source, bug5484)
    assert_equal(':', %r:\::.source, bug5484)
  end

  def test_source_escaped
    expected, result = "$*+.?^|".each_char.map {|c|
      [
        ["\\#{c}", "\\#{c}", 1],
        begin
          re = eval("%r#{c}\\#{c}#{c}", nil, __FILE__, __LINE__)
          t = eval("/\\#{c}/", nil, __FILE__, __LINE__).source
        rescue SyntaxError => e
          [e, t, nil]
        else
          [re.source, t, re =~ "a#{c}a"]
        end
      ]
    }.transpose
    assert_equal(expected, result)
  end

  def test_source_escaped_paren
    bug7610 = '[ruby-core:51088] [Bug #7610]'
    bug8133 = '[ruby-core:53578] [Bug #8133]'
    [
     ["(", ")", bug7610], ["[", "]", bug8133],
     ["{", "}", bug8133], ["<", ">", bug8133],
    ].each do |lparen, rparen, bug|
      s = "\\#{lparen}a\\#{rparen}"
      assert_equal(/#{s}/, eval("%r#{lparen}#{s}#{rparen}"), bug)
    end
  end

  def test_source_unescaped
    expected, result = "!\"#%&',-/:;=@_`~".each_char.map {|c|
      [
        ["#{c}", "\\#{c}", 1],
        begin
          re = eval("%r#{c}\\#{c}#{c}", nil, __FILE__, __LINE__)
          t = eval("%r{\\#{c}}", nil, __FILE__, __LINE__).source
        rescue SyntaxError => e
          [e, t, nil]
        else
          [re.source, t, re =~ "a#{c}a"]
        end
      ]
    }.transpose
    assert_equal(expected, result)
  end

  def test_inspect
    assert_equal('//', //.inspect)
    assert_equal('//i', //i.inspect)
    assert_equal('/\//i', /\//i.inspect)
    assert_equal('/\//i', %r"#{'/'}"i.inspect)
    assert_equal('/\/x/i', /\/x/i.inspect)
    assert_equal('/\x00/i', /#{"\0"}/i.inspect)
    assert_equal("/\n/i", /#{"\n"}/i.inspect)
    s = [0xf1, 0xf2, 0xf3].pack("C*")
    assert_equal('/\/\xF1\xF2\xF3/i', /\/#{s}/i.inspect)
  end

  def test_char_to_option
    assert_equal("BAR", "FOOBARBAZ"[/b../i])
    assert_equal("bar", "foobarbaz"[/  b  .  .  /x])
    assert_equal("bar\n", "foo\nbar\nbaz"[/b.../m])
    assert_raise(SyntaxError) { eval('//z') }
  end

  def test_char_to_option_kcode
    assert_equal("bar", "foobarbaz"[/b../s])
    assert_equal("bar", "foobarbaz"[/b../e])
    assert_equal("bar", "foobarbaz"[/b../u])
  end

  def test_to_s2
    assert_equal('(?-mix:foo)', /(?:foo)/.to_s)
    assert_equal('(?m-ix:foo)', /(?:foo)/m.to_s)
    assert_equal('(?mi-x:foo)', /(?:foo)/mi.to_s)
    assert_equal('(?mix:foo)', /(?:foo)/mix.to_s)
    assert_equal('(?m-ix:foo)', /(?m-ix:foo)/.to_s)
    assert_equal('(?mi-x:foo)', /(?mi-x:foo)/.to_s)
    assert_equal('(?mix:foo)', /(?mix:foo)/.to_s)
    assert_equal('(?mix:)', /(?mix)/.to_s)
    assert_equal('(?-mix:(?mix:foo) )', /(?mix:foo) /.to_s)
  end

  def test_casefold_p
    assert_equal(false, /a/.casefold?)
    assert_equal(true, /a/i.casefold?)
    assert_equal(false, /(?i:a)/.casefold?)
  end

  def test_options
    assert_equal(Regexp::IGNORECASE, /a/i.options)
    assert_equal(Regexp::EXTENDED, /a/x.options)
    assert_equal(Regexp::MULTILINE, /a/m.options)
  end

  def test_match_init_copy
    m = /foo/.match("foo")
    assert_equal(/foo/, m.dup.regexp)
    assert_raise(TypeError) do
      m.instance_eval { initialize_copy(nil) }
    end
    assert_equal([0, 3], m.offset(0))
    assert_equal(/foo/, m.dup.regexp)
  end

  def test_match_size
    m = /(.)(.)(\d+)(\d)/.match("THX1138.")
    assert_equal(5, m.size)
  end

  def test_match_offset_begin_end
    m = /(?<x>b..)/.match("foobarbaz")
    assert_equal([3, 6], m.offset("x"))
    assert_equal(3, m.begin("x"))
    assert_equal(6, m.end("x"))
    assert_raise(IndexError) { m.offset("y") }
    assert_raise(IndexError) { m.offset(2) }
    assert_raise(IndexError) { m.begin(2) }
    assert_raise(IndexError) { m.end(2) }

    m = /(?<x>q..)?/.match("foobarbaz")
    assert_equal([nil, nil], m.offset("x"))
    assert_equal(nil, m.begin("x"))
    assert_equal(nil, m.end("x"))

    m = /\A\u3042(.)(.)?(.)\z/.match("\u3042\u3043\u3044")
    assert_equal([1, 2], m.offset(1))
    assert_equal([nil, nil], m.offset(2))
    assert_equal([2, 3], m.offset(3))
  end

  def test_match_to_s
    m = /(?<x>b..)/.match("foobarbaz")
    assert_equal("bar", m.to_s)
  end

  def test_match_pre_post
    m = /(?<x>b..)/.match("foobarbaz")
    assert_equal("foo", m.pre_match)
    assert_equal("baz", m.post_match)
  end

  def test_match_array
    m = /(...)(...)(...)(...)?/.match("foobarbaz")
    assert_equal(["foobarbaz", "foo", "bar", "baz", nil], m.to_a)
  end

  def test_match_captures
    m = /(...)(...)(...)(...)?/.match("foobarbaz")
    assert_equal(["foo", "bar", "baz", nil], m.captures)
  end

  def test_match_aref
    m = /(...)(...)(...)(...)?/.match("foobarbaz")
    assert_equal("foobarbaz", m[0])
    assert_equal("foo", m[1])
    assert_equal("foo", m[-4])
    assert_nil(m[-1])
    assert_nil(m[-11])
    assert_nil(m[-11, 1])
    assert_nil(m[-11..1])
    assert_nil(m[5])
    assert_nil(m[9])
    assert_equal(["foo", "bar", "baz"], m[1..3])
    assert_equal(["foo", "bar", "baz"], m[1, 3])
    assert_equal([], m[3..1])
    assert_equal([], m[3, 0])
    assert_equal(nil, m[3, -1])
    assert_equal(nil, m[9, 1])
    assert_equal(["baz"], m[3, 1])
    assert_equal(["baz", nil], m[3, 5])
    assert_nil(m[5])
    assert_raise(IndexError) { m[:foo] }
    assert_raise(TypeError) { m[nil] }
  end

  def test_match_values_at
    idx = Object.new
    def idx.to_int; 2; end
    m = /(...)(...)(...)(...)?/.match("foobarbaz")
    assert_equal(["foo", "bar", "baz"], m.values_at(1, 2, 3))
    assert_equal(["foo", "bar", "baz"], m.values_at(1..3))
    assert_equal(["foo", "bar", "baz", nil, nil], m.values_at(1..5))
    assert_equal([], m.values_at(3..1))
    assert_equal([nil, nil, nil, nil, nil], m.values_at(5..9))
    assert_equal(["bar"], m.values_at(idx))
    assert_raise(RangeError){ m.values_at(-11..1) }
    assert_raise(TypeError){ m.values_at(nil) }

    m = /(?<a>\d+) *(?<op>[+\-*\/]) *(?<b>\d+)/.match("1 + 2")
    assert_equal(["1", "2", "+"], m.values_at(:a, 'b', :op))
    assert_equal(["+"], m.values_at(idx))
    assert_raise(TypeError){ m.values_at(nil) }
    assert_raise(IndexError){ m.values_at(:foo) }
  end

  def test_match_string
    m = /(?<x>b..)/.match("foobarbaz")
    assert_equal("foobarbaz", m.string)
  end

  def test_match_inspect
    m = /(...)(...)(...)(...)?/.match("foobarbaz")
    assert_equal('#<MatchData "foobarbaz" 1:"foo" 2:"bar" 3:"baz" 4:nil>', m.inspect)
  end

  def test_initialize
    assert_raise(ArgumentError) { Regexp.new }
    assert_equal(/foo/, Regexp.new(/foo/, Regexp::IGNORECASE))

    assert_equal(Encoding.find("US-ASCII"), Regexp.new("b..", nil, "n").encoding)
    assert_equal("bar", "foobarbaz"[Regexp.new("b..", nil, "n")])
    assert_equal(//n, Regexp.new("", nil, "n"))

    arg_encoding_none = 32 # ARG_ENCODING_NONE is implementation defined value
    assert_equal(arg_encoding_none, Regexp.new("", nil, "n").options)
    assert_equal(arg_encoding_none, Regexp.new("", nil, "N").options)

    assert_raise(RegexpError) { Regexp.new(")(") }
  end

  def test_unescape
    assert_raise(ArgumentError) { s = '\\'; /#{ s }/ }
    assert_equal(/\xFF/n, /#{ s="\\xFF" }/n)
    assert_equal(/\177/, (s = '\177'; /#{ s }/))
    assert_raise(ArgumentError) { s = '\u'; /#{ s }/ }
    assert_raise(ArgumentError) { s = '\u{ ffffffff }'; /#{ s }/ }
    assert_raise(ArgumentError) { s = '\u{ ffffff }'; /#{ s }/ }
    assert_raise(ArgumentError) { s = '\u{ ffff X }'; /#{ s }/ }
    assert_raise(ArgumentError) { s = '\u{ }'; /#{ s }/ }
    assert_equal("b", "abc"[(s = '\u{0062}'; /#{ s }/)])
    assert_equal("b", "abc"[(s = '\u0062'; /#{ s }/)])
    assert_raise(ArgumentError) { s = '\u0'; /#{ s }/ }
    assert_raise(ArgumentError) { s = '\u000X'; /#{ s }/ }
    assert_raise(ArgumentError) { s = "\xff" + '\u3042'; /#{ s }/ }
    assert_raise(ArgumentError) { s = '\u3042' + [0xff].pack("C"); /#{ s }/ }
    assert_raise(SyntaxError) { s = ''; eval(%q(/\u#{ s }/)) }

    assert_equal(/a/, eval(%q(s="\u0061";/#{s}/n)))
    assert_raise(RegexpError) { s = "\u3042"; eval(%q(/#{s}/n)) }
    assert_raise(RegexpError) { s = "\u0061"; eval(%q(/\u3042#{s}/n)) }
    assert_raise(RegexpError) { s1=[0xff].pack("C"); s2="\u3042"; eval(%q(/#{s1}#{s2}/)); [s1, s2] }

    assert_raise(ArgumentError) { s = '\x'; /#{ s }/ }

    assert_equal("\xe1", [0x00, 0xe1, 0xff].pack("C*")[/\M-a/])
    assert_equal("\xdc", [0x00, 0xdc, 0xff].pack("C*")[/\M-\\/])
    assert_equal("\x8a", [0x00, 0x8a, 0xff].pack("C*")[/\M-\n/])
    assert_equal("\x89", [0x00, 0x89, 0xff].pack("C*")[/\M-\t/])
    assert_equal("\x8d", [0x00, 0x8d, 0xff].pack("C*")[/\M-\r/])
    assert_equal("\x8c", [0x00, 0x8c, 0xff].pack("C*")[/\M-\f/])
    assert_equal("\x8b", [0x00, 0x8b, 0xff].pack("C*")[/\M-\v/])
    assert_equal("\x87", [0x00, 0x87, 0xff].pack("C*")[/\M-\a/])
    assert_equal("\x9b", [0x00, 0x9b, 0xff].pack("C*")[/\M-\e/])
    assert_equal("\x01", [0x00, 0x01, 0xff].pack("C*")[/\C-a/])

    assert_raise(ArgumentError) { s = '\M'; /#{ s }/ }
    assert_raise(ArgumentError) { s = '\M-\M-a'; /#{ s }/ }
    assert_raise(ArgumentError) { s = '\M-\\'; /#{ s }/ }

    assert_raise(ArgumentError) { s = '\C'; /#{ s }/ }
    assert_raise(ArgumentError) { s = '\c'; /#{ s }/ }
    assert_raise(ArgumentError) { s = '\C-\C-a'; /#{ s }/ }

    assert_raise(ArgumentError) { s = '\M-\z'; /#{ s }/ }
    assert_raise(ArgumentError) { s = '\M-\777'; /#{ s }/ }

    assert_equal("\u3042\u3042", "\u3042\u3042"[(s = "\u3042" + %q(\xe3\x81\x82); /#{s}/)])
    assert_raise(ArgumentError) { s = "\u3042" + %q(\xe3); /#{s}/ }
    assert_raise(ArgumentError) { s = "\u3042" + %q(\xe3\xe3); /#{s}/ }
    assert_raise(ArgumentError) { s = '\u3042' + [0xff].pack("C"); /#{s}/ }

    assert_raise(SyntaxError) { eval("/\u3042/n") }

    s = ".........."
    5.times { s.sub!(".", "") }
    assert_equal(".....", s)
  end

  def test_equal
    bug5484 = '[ruby-core:40364]'
    assert_equal(/abc/, /abc/)
    assert_not_equal(/abc/, /abc/m)
    assert_not_equal(/abc/, /abd/)
    assert_equal(/\/foo/, Regexp.new('/foo'), bug5484)
  end

  def test_match
    assert_nil(//.match(nil))
    assert_equal("abc", /.../.match(:abc)[0])
    assert_raise(TypeError) { /.../.match(Object.new)[0] }
    assert_equal("bc", /../.match('abc', 1)[0])
    assert_equal("bc", /../.match('abc', -2)[0])
    assert_nil(/../.match("abc", -4))
    assert_nil(/../.match("abc", 4))
    assert_equal('\x', /../n.match("\u3042" + '\x', 1)[0])

    r = nil
    /.../.match("abc") {|m| r = m[0] }
    assert_equal("abc", r)

    $_ = "abc"; assert_equal(1, ~/bc/)
    $_ = "abc"; assert_nil(~/d/)
    $_ = nil; assert_nil(~/./)
  end

  def test_match_p
    /backref/ =~ 'backref'
    # must match here, but not in a separate method, e.g., assert_send,
    # to check if $~ is affected or not.
    assert_equal(false, //.match?(nil))
    assert_equal(true, //.match?(""))
    assert_equal(true, /.../.match?(:abc))
    assert_raise(TypeError) { /.../.match?(Object.new) }
    assert_equal(true, /b/.match?('abc'))
    assert_equal(true, /b/.match?('abc', 1))
    assert_equal(true, /../.match?('abc', 1))
    assert_equal(true, /../.match?('abc', -2))
    assert_equal(false, /../.match?("abc", -4))
    assert_equal(false, /../.match?("abc", 4))
    assert_equal(true, /../n.match?("\u3042" + '\x', 1))
    assert_equal(true, /\z/.match?(""))
    assert_equal(true, /\z/.match?("abc"))
    assert_equal(true, /R.../.match?("Ruby"))
    assert_equal(false, /R.../.match?("Ruby", 1))
    assert_equal(false, /P.../.match?("Ruby"))
    assert_equal('backref', $&)
  end

  def test_eqq
    assert_equal(false, /../ === nil)
  end

  def test_quote
    assert_equal("\xff", Regexp.quote([0xff].pack("C")))
    assert_equal("\\ ", Regexp.quote("\ "))
    assert_equal("\\t", Regexp.quote("\t"))
    assert_equal("\\n", Regexp.quote("\n"))
    assert_equal("\\r", Regexp.quote("\r"))
    assert_equal("\\f", Regexp.quote("\f"))
    assert_equal("\\v", Regexp.quote("\v"))
    assert_equal("\u3042\\t", Regexp.quote("\u3042\t"))
    assert_equal("\\t\xff", Regexp.quote("\t" + [0xff].pack("C")))
  end

  def test_try_convert
    assert_equal(/re/, Regexp.try_convert(/re/))
    assert_nil(Regexp.try_convert("re"))

    o = Object.new
    assert_nil(Regexp.try_convert(o))
    def o.to_regexp() /foo/ end
    assert_equal(/foo/, Regexp.try_convert(o))
  end

  def test_union2
    assert_equal(/(?!)/, Regexp.union)
    assert_equal(/foo/, Regexp.union(/foo/))
    assert_equal(/foo/, Regexp.union([/foo/]))
    assert_equal(/\t/, Regexp.union("\t"))
    assert_equal(/(?-mix:\u3042)|(?-mix:\u3042)/, Regexp.union(/\u3042/, /\u3042/))
    assert_equal("\u3041", "\u3041"[Regexp.union(/\u3042/, "\u3041")])
  end

  def test_dup
    assert_equal(//, //.dup)
    assert_raise(TypeError) { //.instance_eval { initialize_copy(nil) } }
  end

  def test_regsub
    assert_equal("fooXXXbaz", "foobarbaz".sub!(/bar/, "XXX"))
    s = [0xff].pack("C")
    assert_equal(s, "X".sub!(/./, s))
    assert_equal('\\' + s, "X".sub!(/./, '\\' + s))
    assert_equal('\k', "foo".sub!(/.../, '\k'))
    assert_raise(RuntimeError) { "foo".sub!(/(?<x>o)/, '\k<x') }
    assert_equal('foo[bar]baz', "foobarbaz".sub!(/(b..)/, '[\0]'))
    assert_equal('foo[foo]baz', "foobarbaz".sub!(/(b..)/, '[\`]'))
    assert_equal('foo[baz]baz', "foobarbaz".sub!(/(b..)/, '[\\\']'))
    assert_equal('foo[r]baz', "foobarbaz".sub!(/(b)(.)(.)/, '[\+]'))
    assert_equal('foo[\\]baz', "foobarbaz".sub!(/(b..)/, '[\\\\]'))
    assert_equal('foo[\z]baz', "foobarbaz".sub!(/(b..)/, '[\z]'))
  end

  def test_regsub_K
    bug8856 = '[ruby-dev:47694] [Bug #8856]'
    result = "foobarbazquux/foobarbazquux".gsub(/foo\Kbar/, "")
    assert_equal('foobazquux/foobazquux', result, bug8856)
  end

  def test_KCODE
    assert_nil($KCODE)
    assert_nothing_raised { $KCODE = nil }
    assert_equal(false, $=)
    assert_nothing_raised { $= = nil }
  end

  def test_KCODE_warning
    assert_warning(/variable \$KCODE is no longer effective; ignored/) { $KCODE = nil }
    assert_warning(/variable \$KCODE is no longer effective/) { $KCODE = nil }
  end

  def test_ignorecase_warning
    assert_warning(/variable \$= is no longer effective; ignored/) { $= = nil }
    assert_warning(/variable \$= is no longer effective/) { $= }
  end

  def test_match_setter
    /foo/ =~ "foo"
    m = $~
    /bar/ =~ "bar"
    $~ = m
    assert_equal("foo", $&)
  end

  def test_match_without_regexp
    bug10877 = '[ruby-core:68209] [Bug #10877]'
    "abc".sub("a", "")
    assert_raise_with_message(IndexError, /foo/, bug10877) {$~["foo"]}
    key = "\u{3042}"
    [Encoding::UTF_8, Encoding::Shift_JIS, Encoding::EUC_JP].each do |enc|
      idx = key.encode(enc)
      assert_raise_with_message(IndexError, /#{idx}/, bug10877) {$~[idx]}
    end
  end

  def test_last_match
    /(...)(...)(...)(...)?/.match("foobarbaz")
    assert_equal("foobarbaz", Regexp.last_match(0))
    assert_equal("foo", Regexp.last_match(1))
    assert_nil(Regexp.last_match(5))
    assert_nil(Regexp.last_match(-1))
  end

  def test_getter
    alias $__REGEXP_TEST_LASTMATCH__ $&
    alias $__REGEXP_TEST_PREMATCH__ $`
    alias $__REGEXP_TEST_POSTMATCH__ $'
    alias $__REGEXP_TEST_LASTPARENMATCH__ $+
    /(b)(.)(.)/.match("foobarbaz")
    assert_equal("bar", $__REGEXP_TEST_LASTMATCH__)
    assert_equal("foo", $__REGEXP_TEST_PREMATCH__)
    assert_equal("baz", $__REGEXP_TEST_POSTMATCH__)
    assert_equal("r", $__REGEXP_TEST_LASTPARENMATCH__)

    /(...)(...)(...)/.match("foobarbaz")
    assert_equal("baz", $+)
  end

  def test_rindex_regexp
    assert_equal(3, "foobarbaz\u3042".rindex(/b../n, 5))
  end

  def assert_regexp(re, ss, fs = [], msg = nil)
    re = Regexp.new(re) unless re.is_a?(Regexp)
    ss = [ss] unless ss.is_a?(Array)
    ss.each do |e, s|
      s ||= e
      assert_match(re, s, msg)
      m = re.match(s)
      assert_equal(e, m[0], msg)
    end
    fs = [fs] unless fs.is_a?(Array)
    fs.each {|s| assert_no_match(re, s, msg) }
  end
  alias check assert_regexp

  def assert_fail(re)
    assert_raise(RegexpError) { %r"#{ re }" }
  end
  alias failcheck assert_fail

  def test_parse
    check(/\*\+\?\{\}\|\(\)\<\>\`\'/, "*+?{}|()<>`'")
    check(/\A\w\W\z/, %w(a. b!), %w(.. ab))
    check(/\A.\b.\b.\B.\B.\z/, %w(a.aaa .a...), %w(aaaaa .....))
    check(/\A\s\S\z/, [' a', "\n."], ['  ', "\n\n", 'a '])
    check(/\A\d\D\z/, '0a', %w(00 aa))
    check(/\A\h\H\z/, %w(0g ag BH), %w(a0 af GG))
    check(/\Afoo\Z\s\z/, "foo\n", ["foo", "foo\nbar"])
    assert_equal(%w(a b c), "abc def".scan(/\G\w/))
    check(/\A\u3042\z/, "\u3042", ["", "\u3043", "a"])
    check(/\A(..)\1\z/, %w(abab ....), %w(abba aba))
    failcheck('\1')
    check(/\A\80\z/, "80", ["\100", ""])
    check(/\A\77\z/, "?")
    check(/\A\78\z/, "\7" + '8', ["\100", ""])
    check(eval('/\A\Qfoo\E\z/'), "QfooE")
    check(/\Aa++\z/, "aaa")
    check('\Ax]\z', "x]")
    check(/x#foo/x, "x", "#foo")
    check(/\Ax#foo#{ "\n" }x\z/x, "xx", ["x", "x#foo\nx"])
    check(/\A\p{Alpha}\z/, ["a", "z"], [".", "", ".."])
    check(/\A\p{^Alpha}\z/, [".", "!"], ["!a", ""])
    check(/\A\n\z/, "\n")
    check(/\A\t\z/, "\t")
    check(/\A\r\z/, "\r")
    check(/\A\f\z/, "\f")
    check(/\A\a\z/, "\007")
    check(/\A\e\z/, "\033")
    check(/\A\v\z/, "\v")
    failcheck('(')
    failcheck('(?foo)')
    failcheck('/\p{foobarbazqux}/')
    failcheck('/\p{foobarbazqux' + 'a' * 1000 + '}/')
    failcheck('/[1-\w]/')
  end

  def test_exec
    check(/A*B/, %w(B AB AAB AAAB), %w(A))
    check(/\w*!/, %w(! a! ab! abc!), %w(abc))
    check(/\w*\W/, %w(! a" ab# abc$), %w(abc))
    check(/\w*\w/, %w(z az abz abcz), %w(!))
    check(/[a-z]*\w/, %w(z az abz abcz), %w(!))
    check(/[a-z]*\W/, %w(! a" ab# abc$), %w(A))
    check(/((a|bb|ccc|dddd)(1|22|333|4444))/i, %w(a1 bb1 a22), %w(a2 b1))
    check(/\u0080/, (1..4).map {|i| ["\u0080", "\u0080" * i] }, ["\u0081"])
    check(/\u0080\u0080/, (2..4).map {|i| ["\u0080" * 2, "\u0080" * i] }, ["\u0081"])
    check(/\u0080\u0080\u0080/, (3..4).map {|i| ["\u0080" * 3, "\u0080" * i] }, ["\u0081"])
    check(/\u0080\u0080\u0080\u0080/, (4..4).map {|i| ["\u0080" * 4, "\u0080" * i] }, ["\u0081"])
    check(/[^\u3042\u3043\u3044]/, %W(a b \u0080 \u3041 \u3045), %W(\u3042 \u3043 \u3044))
    check(/a.+/m, %W(a\u0080 a\u0080\u0080 a\u0080\u0080\u0080), %W(a))
    check(/a.+z/m, %W(a\u0080z a\u0080\u0080z a\u0080\u0080\u0080z), %W(az))
    check(/abc\B.\Bxyz/, %w(abcXxyz abc0xyz), %w(abc|xyz abc-xyz))
    check(/\Bxyz/, [%w(xyz abcXxyz), %w(xyz abc0xyz)], %w(abc xyz abc-xyz))
    check(/abc\B/, [%w(abc abcXxyz), %w(abc abc0xyz)], %w(abc xyz abc-xyz))
    failcheck('(?<foo>abc)\1')
    check(/^(A+|B+)(?>\g<1>)*[BC]$/, %w(AC BC ABC BAC AABBC), %w(AABB))
    check(/^(A+|B(?>\g<1>)*)[AC]$/, %w(AAAC BBBAAAAC), %w(BBBAAA))
    check(/^()(?>\g<1>)*$/, "", "a")
    check(/^(?>(?=a)(#{ "a" * 1000 }|))++$/, ["a" * 1000, "a" * 2000, "a" * 3000], ["", "a" * 500, "b" * 1000])
    check(eval('/^(?:a?)?$/'), ["", "a"], ["aa"])
    check(eval('/^(?:a+)?$/'), ["", "a", "aa"], ["ab"])
    check(/^(?:a?)+?$/, ["", "a", "aa"], ["ab"])
    check(/^a??[ab]/, [["a", "a"], ["a", "aa"], ["b", "b"], ["a", "ab"]], ["c"])
    check(/^(?:a*){3,5}$/, ["", "a", "aa", "aaa", "aaaa", "aaaaa", "aaaaaa"], ["b"])
    check(/^(?:a+){3,5}$/, ["aaa", "aaaa", "aaaaa", "aaaaaa"], ["", "a", "aa", "b"])
  end

  def test_parse_look_behind
    check(/(?<=A)B(?=C)/, [%w(B ABC)], %w(aBC ABc aBc))
    check(/(?<!A)B(?!C)/, [%w(B aBc)], %w(ABC aBC ABc))
    failcheck('(?<=.*)')
    failcheck('(?<!.*)')
    check(/(?<=A|B.)C/, [%w(C AC), %w(C BXC)], %w(C BC))
    check(/(?<!A|B.)C/, [%w(C C), %w(C BC)], %w(AC BXC))

    assert_not_match(/(?<!aa|b)c/i, "Aac")
    assert_not_match(/(?<!b|aa)c/i, "Aac")
  end

  def test_parse_kg
    check(/\A(.)(.)\k<1>(.)\z/, %w(abac abab ....), %w(abcd aaba xxx))
    check(/\A(.)(.)\k<-1>(.)\z/, %w(abbc abba ....), %w(abcd aaba xxx))
    check(/\A(?<n>.)(?<x>\g<n>){0}(?<y>\k<n+0>){0}\g<x>\g<y>\z/, "aba", "abb")
    check(/\A(?<n>.)(?<x>\g<n>){0}(?<y>\k<n+1>){0}\g<x>\g<y>\z/, "abb", "aba")
    check(/\A(?<x>..)\k<x>\z/, %w(abab ....), %w(abac abba xxx))
    check(/\A(.)(..)\g<-1>\z/, "abcde", %w(.... ......))
    failcheck('\k<x>')
    failcheck('\k<')
    failcheck('\k<>')
    failcheck('\k<.>')
    failcheck('\k<x.>')
    failcheck('\k<1.>')
    failcheck('\k<x')
    failcheck('\k<x+')
    failcheck('()\k<-2>')
    failcheck('()\g<-2>')
    check(/\A(?<x>.)(?<x>.)\k<x>\z/, %w(aba abb), %w(abc .. ....))
    check(/\A(?<x>.)(?<x>.)\k<x>\z/i, %w(aba ABa abb ABb), %w(abc .. ....))
    check('\k\g', "kg")
    failcheck('(.\g<1>)')
    failcheck('(.\g<2>)')
    failcheck('(?=\g<1>)')
    failcheck('((?=\g<1>))')
    failcheck('(\g<1>|.)')
    failcheck('(.|\g<1>)')
    check(/(!)(?<=(a)|\g<1>)/, ["!"], %w(a))
    check(/^(a|b\g<1>c)$/, %w(a bac bbacc bbbaccc), %w(bbac bacc))
    check(/^(a|b\g<2>c)(B\g<1>C){0}$/, %w(a bBaCc bBbBaCcCc bBbBbBaCcCcCc), %w(bBbBaCcC BbBaCcCc))
    check(/\A(?<n>.|X\g<n>)(?<x>\g<n>){0}(?<y>\k<n+0>){0}\g<x>\g<y>\z/, "XXaXbXXa", %w(XXabXa abb))
    check(/\A(?<n>.|X\g<n>)(?<x>\g<n>){0}(?<y>\k<n+1>){0}\g<x>\g<y>\z/, "XaXXbXXb", %w(aXXbXb aba))
    failcheck('(?<x>)(?<x>)(\g<x>)')
    check(/^(?<x>foo)(bar)\k<x>/, %w(foobarfoo), %w(foobar barfoo))
    check(/^(?<a>f)(?<a>o)(?<a>o)(?<a>b)(?<a>a)(?<a>r)(?<a>b)(?<a>a)(?<a>z)\k<a>{9}$/, %w(foobarbazfoobarbaz foobarbazbazbarfoo foobarbazzabraboof), %w(foobar barfoo))
  end

  def test_parse_curly_brace
    check(/\A{/, ["{", ["{", "{x"]])
    check(/\A{ /, ["{ ", ["{ ", "{ x"]])
    check(/\A{,}\z/, "{,}")
    check(/\A{}\z/, "{}")
    check(/\Aa{0}+\z/, "", %w(a aa aab))
    check(/\Aa{1}+\z/, %w(a aa), ["", "aab"])
    check(/\Aa{1,2}b{1,2}\z/, %w(ab aab abb aabb), ["", "aaabb", "abbb"])
    check(/(?!x){0,1}/, [ ['', 'ab'], ['', ''] ])
    check(/c\z{0,1}/, [ ['c', 'abc'], ['c', 'cab']], ['abd'])
    check(/\A{0,1}a/, [ ['a', 'abc'], ['a', '____abc']], ['bcd'])
    failcheck('.{100001}')
    failcheck('.{0,100001}')
    failcheck('.{1,0}')
    failcheck('{0}')
  end

  def test_parse_comment
    check(/\A(?#foo\)bar)\z/, "", "a")
    failcheck('(?#')
  end

  def test_char_type
    check(/\u3042\d/, ["\u30421", "\u30422"])

    # CClassTable cache test
    assert_match(/\u3042\d/, "\u30421")
    assert_match(/\u3042\d/, "\u30422")
  end

  def test_char_class
    failcheck('[]')
    failcheck('[x')
    check('\A[]]\z', "]", "")
    check('\A[]\.]+\z', %w(] . ]..]), ["", "["])
    check(/\A[\u3042]\z/, "\u3042", "\u3042aa")
    check(/\A[\u3042\x61]+\z/, ["aa\u3042aa", "\u3042\u3042", "a"], ["", "b"])
    check(/\A[\u3042\x61\x62]+\z/, "abab\u3042abab\u3042")
    check(/\A[abc]+\z/, "abcba", ["", "ada"])
    check(/\A[\w][\W]\z/, %w(a. b!), %w(.. ab))
    check(/\A[\s][\S]\z/, [' a', "\n."], ['  ', "\n\n", 'a '])
    check(/\A[\d][\D]\z/, '0a', %w(00 aa))
    check(/\A[\h][\H]\z/, %w(0g ag BH), %w(a0 af GG))
    check(/\A[\p{Alpha}]\z/, ["a", "z"], [".", "", ".."])
    check(/\A[\p{^Alpha}]\z/, [".", "!"], ["!a", ""])
    check(/\A[\xff]\z/, "\xff", ["", "\xfe"])
    check(/\A[\80]+\z/, "8008", ["\\80", "\100", "\1000"])
    check(/\A[\77]+\z/, "???")
    check(/\A[\78]+\z/, "\788\7")
    check(/\A[\0]\z/, "\0")
    check(/\A[[:0]]\z/, [":", "0"], ["", ":0"])
    check(/\A[0-]\z/, ["0", "-"], "0-")
    check('\A[a-&&\w]\z', "a", "-")
    check('\A[--0]\z', ["-", "/", "0"], ["", "1"])
    check('\A[\'--0]\z', %w(* + \( \) 0 ,), ["", ".", "1"])
    check(/\A[a-b-]\z/, %w(a b -), ["", "c"])
    check('\A[a-b-&&\w]\z', %w(a b), ["", "-"])
    check('\A[a-b-&&\W]\z', "-", ["", "a", "b"])
    check('\A[a-c-e]\z', %w(a b c e -), %w(d))
    check(/\A[a-f&&[^b-c]&&[^e]]\z/, %w(a d f), %w(b c e g 0))
    check(/\A[[^b-c]&&[^e]&&a-f]\z/, %w(a d f), %w(b c e g 0))
    check(/\A[\n\r\t]\z/, ["\n", "\r", "\t"])
    failcheck('[9-1]')

    assert_match(/\A\d+\z/, "0123456789")
    assert_no_match(/\d/, "\uff10\uff11\uff12\uff13\uff14\uff15\uff16\uff17\uff18\uff19")
    assert_match(/\A\w+\z/, "09azAZ_")
    assert_no_match(/\w/, "\uff10\uff19\uff41\uff5a\uff21\uff3a")
    assert_match(/\A\s+\z/, "\r\n\v\f\r\s")
    assert_no_match(/\s/, "\u0085")
  end

  def test_posix_bracket
    check(/\A[[:alpha:]0]\z/, %w(0 a), %w(1 .))
    check(eval('/\A[[:^alpha:]0]\z/'), %w(0 1 .), "a")
    check(eval('/\A[[:alpha\:]]\z/'), %w(a l p h a :), %w(b 0 1 .))
    check(eval('/\A[[:alpha:foo]0]\z/'), %w(0 a), %w(1 .))
    check(/\A[[:xdigit:]&&[:alpha:]]\z/, "a", %w(g 0))
    check('\A[[:abcdefghijklmnopqrstu:]]+\z', "[]")
    failcheck('[[:alpha')
    failcheck('[[:alpha:')
    failcheck('[[:alp:]]')

    assert_match(/\A[[:digit:]]+\z/, "\uff10\uff11\uff12\uff13\uff14\uff15\uff16\uff17\uff18\uff19")
    assert_match(/\A[[:alnum:]]+\z/, "\uff10\uff19\uff41\uff5a\uff21\uff3a")
    assert_match(/\A[[:space:]]+\z/, "\r\n\v\f\r\s\u0085")
    assert_match(/\A[[:ascii:]]+\z/, "\x00\x7F")
    assert_no_match(/[[:ascii:]]/, "\x80\xFF")
  end

  def test_backward
    assert_equal(3, "foobar".rindex(/b.r/i))
    assert_equal(nil, "foovar".rindex(/b.r/i))
    assert_equal(3, ("foo" + "bar" * 1000).rindex(/#{"bar"*1000}/))
    assert_equal(4, ("foo\nbar\nbaz\n").rindex(/bar/i))
  end

  def test_uninitialized
    assert_raise(TypeError) { Regexp.allocate.hash }
    assert_raise(TypeError) { Regexp.allocate.eql? Regexp.allocate }
    assert_raise(TypeError) { Regexp.allocate == Regexp.allocate }
    assert_raise(TypeError) { Regexp.allocate =~ "" }
    assert_equal(false, Regexp.allocate === Regexp.allocate)
    assert_nil(~Regexp.allocate)
    assert_raise(TypeError) { Regexp.allocate.match("") }
    assert_raise(TypeError) { Regexp.allocate.to_s }
    assert_match(/^#<Regexp:.*>$/, Regexp.allocate.inspect)
    assert_raise(TypeError) { Regexp.allocate.source }
    assert_raise(TypeError) { Regexp.allocate.casefold? }
    assert_raise(TypeError) { Regexp.allocate.options }
    assert_equal(Encoding.find("ASCII-8BIT"), Regexp.allocate.encoding)
    assert_equal(false, Regexp.allocate.fixed_encoding?)
    assert_raise(TypeError) { Regexp.allocate.names }
    assert_raise(TypeError) { Regexp.allocate.named_captures }

    assert_raise(TypeError) { MatchData.allocate.regexp }
    assert_raise(TypeError) { MatchData.allocate.names }
    assert_raise(TypeError) { MatchData.allocate.size }
    assert_raise(TypeError) { MatchData.allocate.length }
    assert_raise(TypeError) { MatchData.allocate.offset(0) }
    assert_raise(TypeError) { MatchData.allocate.begin(0) }
    assert_raise(TypeError) { MatchData.allocate.end(0) }
    assert_raise(TypeError) { MatchData.allocate.to_a }
    assert_raise(TypeError) { MatchData.allocate[:foo] }
    assert_raise(TypeError) { MatchData.allocate.captures }
    assert_raise(TypeError) { MatchData.allocate.values_at }
    assert_raise(TypeError) { MatchData.allocate.pre_match }
    assert_raise(TypeError) { MatchData.allocate.post_match }
    assert_raise(TypeError) { MatchData.allocate.to_s }
    assert_match(/^#<MatchData:.*>$/, MatchData.allocate.inspect)
    assert_raise(TypeError) { MatchData.allocate.string }
    $~ = MatchData.allocate
    assert_raise(TypeError) { $& }
    assert_raise(TypeError) { $` }
    assert_raise(TypeError) { $' }
    assert_raise(TypeError) { $+ }
  end

  def test_unicode
    assert_match(/^\u3042{0}\p{Any}$/, "a")
    assert_match(/^\u3042{0}\p{Any}$/, "\u3041")
    assert_match(/^\u3042{0}\p{Any}$/, "\0")
    assert_match(/^\p{Lo}{4}$/u, "\u3401\u4E01\u{20001}\u{2A701}")
    assert_no_match(/^\u3042{0}\p{Any}$/, "\0\0")
    assert_no_match(/^\u3042{0}\p{Any}$/, "")
    assert_raise(SyntaxError) { eval('/^\u3042{0}\p{' + "\u3042" + '}$/') }
    assert_raise(SyntaxError) { eval('/^\u3042{0}\p{' + 'a' * 1000 + '}$/') }
    assert_raise(SyntaxError) { eval('/^\u3042{0}\p{foobarbazqux}$/') }
    assert_match(/^(\uff21)(a)\1\2$/i, "\uff21A\uff41a")
    assert_no_match(/^(\uff21)\1$/i, "\uff21A")
    assert_no_match(/^(\uff41)\1$/i, "\uff41a")
    assert_match(/^\u00df$/i, "\u00df")
    assert_match(/^\u00df$/i, "ss")
    #assert_match(/^(\u00df)\1$/i, "\u00dfss") # this must be bug...
    assert_match(/^\u00df{2}$/i, "\u00dfss")
    assert_match(/^\u00c5$/i, "\u00c5")
    assert_match(/^\u00c5$/i, "\u00e5")
    assert_match(/^\u00c5$/i, "\u212b")
    assert_match(/^(\u00c5)\1\1$/i, "\u00c5\u00e5\u212b")
    assert_match(/^\u0149$/i, "\u0149")
    assert_match(/^\u0149$/i, "\u02bcn")
    #assert_match(/^(\u0149)\1$/i, "\u0149\u02bcn") # this must be bug...
    assert_match(/^\u0149{2}$/i, "\u0149\u02bcn")
    assert_match(/^\u0390$/i, "\u0390")
    assert_match(/^\u0390$/i, "\u03b9\u0308\u0301")
    #assert_match(/^(\u0390)\1$/i, "\u0390\u03b9\u0308\u0301") # this must be bug...
    assert_match(/^\u0390{2}$/i, "\u0390\u03b9\u0308\u0301")
    assert_match(/^\ufb05$/i, "\ufb05")
    assert_match(/^\ufb05$/i, "\ufb06")
    assert_match(/^\ufb05$/i, "st")
    #assert_match(/^(\ufb05)\1\1$/i, "\ufb05\ufb06st") # this must be bug...
    assert_match(/^\ufb05{3}$/i, "\ufb05\ufb06st")
    assert_match(/^\u03b9\u0308\u0301$/i, "\u0390")
  end

  def test_unicode_age
    assert_match(/^\p{Age=6.0}$/u, "\u261c")
    assert_match(/^\p{Age=1.1}$/u, "\u261c")
    assert_no_match(/^\P{age=6.0}$/u, "\u261c")

    assert_match(/^\p{age=6.0}$/u, "\u31f6")
    assert_match(/^\p{age=3.2}$/u, "\u31f6")
    assert_no_match(/^\p{age=3.1}$/u, "\u31f6")
    assert_no_match(/^\p{age=3.0}$/u, "\u31f6")
    assert_no_match(/^\p{age=1.1}$/u, "\u31f6")

    assert_match(/^\p{age=6.0}$/u, "\u2754")
    assert_no_match(/^\p{age=5.0}$/u, "\u2754")
    assert_no_match(/^\p{age=4.0}$/u, "\u2754")
    assert_no_match(/^\p{age=3.0}$/u, "\u2754")
    assert_no_match(/^\p{age=2.0}$/u, "\u2754")
    assert_no_match(/^\p{age=1.1}$/u, "\u2754")
  end

  MatchData_A = eval("class MatchData_\u{3042} < MatchData; self; end")

  def test_matchdata
    a = "haystack".match(/hay/)
    b = "haystack".match(/hay/)
    assert_equal(a, b, '[ruby-core:24748]')
    h = {a => 42}
    assert_equal(42, h[b], '[ruby-core:24748]')
    assert_match(/#<TestRegexp::MatchData_\u{3042}:/, MatchData_A.allocate.inspect)

    h = /^(?<@time>\d+): (?<body>.*)/.match("123456: hoge fuga")
    assert_equal("123456", h["@time"])
    assert_equal("hoge fuga", h["body"])
  end

  def test_regexp_poped
    assert_nothing_raised { eval("a = 1; /\#{ a }/; a") }
    assert_nothing_raised { eval("a = 1; /\#{ a }/o; a") }
  end

  def test_invalid_fragment
    bug2547 = '[ruby-core:27374]'
    assert_raise(SyntaxError, bug2547) {eval('/#{"\\\\"}y/')}
  end

  def test_dup_warn
    assert_warning(/duplicated/) { Regexp.new('[\u3042\u3043\u3042]') }
    assert_warning(/duplicated/) { Regexp.new('[\u3042\u3043\u3043]') }
    assert_warning(/\A\z/) { Regexp.new('[\u3042\u3044\u3043]') }
    assert_warning(/\A\z/) { Regexp.new('[\u3042\u3045\u3043]') }
    assert_warning(/\A\z/) { Regexp.new('[\u3042\u3045\u3044]') }
    assert_warning(/\A\z/) { Regexp.new('[\u3042\u3045\u3043-\u3044]') }
    assert_warning(/duplicated/) { Regexp.new('[\u3042\u3045\u3042-\u3043]') }
    assert_warning(/duplicated/) { Regexp.new('[\u3042\u3045\u3044-\u3045]') }
    assert_warning(/\A\z/) { Regexp.new('[\u3042\u3046\u3044]') }
    assert_warning(/duplicated/) { Regexp.new('[\u1000-\u2000\u3042-\u3046\u3044]') }
    assert_warning(/duplicated/) { Regexp.new('[\u3044\u3041-\u3047]') }
    assert_warning(/duplicated/) { Regexp.new('[\u3042\u3044\u3046\u3041-\u3047]') }

    bug7471 = '[ruby-core:50344]'
    assert_warning('', bug7471) { Regexp.new('[\D]') =~ "\u3042" }

    bug8151 = '[ruby-core:53649]'
    assert_warning(/\A\z/, bug8151) { Regexp.new('(?:[\u{33}])').to_s }
  end

  def test_property_warn
    assert_in_out_err('-w', 'x=/\p%s/', [], %r"warning: invalid Unicode Property \\p: /\\p%s/")
  end

  def test_invalid_escape_error
    bug3539 = '[ruby-core:31048]'
    error = assert_raise(SyntaxError) {eval('/\x/', nil, bug3539)}
    assert_match(/invalid hex escape/, error.message)
    assert_equal(1, error.message.scan(/.*invalid .*escape.*/i).size, bug3539)
  end

  def test_raw_hyphen_and_tk_char_type_after_range
    bug6853 = '[ruby-core:47115]'
    # use Regexp.new instead of literal to ignore a parser warning.
    check(Regexp.new('[0-1-\\s]'), [' ', '-'], ['2', 'a'], bug6853)
  end

  def test_error_message_on_failed_conversion
    bug7539 = '[ruby-core:50733]'
    assert_equal false, /x/=== 42
    assert_raise_with_message(TypeError, 'no implicit conversion of Integer into String', bug7539) {
      Regexp.quote(42)
    }
  end

  def test_conditional_expression
    bug8583 = '[ruby-dev:47480] [Bug #8583]'

    conds = {"xy"=>true, "yx"=>true, "xx"=>false, "yy"=>false}
    assert_match_each(/\A((x)|(y))(?(2)y|x)\z/, conds, bug8583)
    assert_match_each(/\A((?<x>x)|(?<y>y))(?(<x>)y|x)\z/, conds, bug8583)

    bug12418 = '[ruby-core:75694] [Bug #12418]'
    assert_raise(RegexpError, bug12418){ Regexp.new('(0?0|(?(5)||)|(?(5)||))?') }
  end

  def test_options_in_look_behind
    assert_nothing_raised {
      assert_match_at("(?<=(?i)ab)cd", "ABcd", [[2,4]])
      assert_match_at("(?<=(?i:ab))cd", "ABcd", [[2,4]])
      assert_match_at("(?<!(?i)ab)cd", "aacd", [[2,4]])
      assert_match_at("(?<!(?i:ab))cd", "aacd", [[2,4]])

      assert_not_match("(?<=(?i)ab)cd", "ABCD")
      assert_not_match("(?<=(?i:ab))cd", "ABCD")
      assert_not_match("(?<!(?i)ab)cd", "ABcd")
      assert_not_match("(?<!(?i:ab))cd", "ABcd")
    }
  end

  def test_once
    pr1 = proc{|i| /#{i}/o}
    assert_equal(/0/, pr1.call(0))
    assert_equal(/0/, pr1.call(1))
    assert_equal(/0/, pr1.call(2))
  end

  def test_once_recursive
    pr2 = proc{|i|
      if i > 0
        /#{pr2.call(i-1).to_s}#{i}/
      else
        //
      end
    }
    assert_equal(/(?-mix:(?-mix:(?-mix:)1)2)3/, pr2.call(3))
  end

  def test_once_multithread
    m = Mutex.new
    pr3 = proc{|i|
      /#{m.unlock; sleep 0.5; i}/o
    }
    ary = []
    n = 0
    th1 = Thread.new{m.lock; ary << pr3.call(n+=1)}
    th2 = Thread.new{m.lock; ary << pr3.call(n+=1)}
    th1.join; th2.join
    assert_equal([/1/, /1/], ary)
  end

  def test_once_escape
    pr4 = proc{|i|
      catch(:xyzzy){
        /#{throw :xyzzy, i}/o =~ ""
        :ng
      }
    }
    assert_equal(0, pr4.call(0))
    assert_equal(1, pr4.call(1))
  end

  def test_eq_tilde_can_be_overridden
    assert_separately([], <<-RUBY)
      class Regexp
        undef =~
        def =~(str)
          "foo"
        end
      end

      assert_equal("foo", // =~ "")
    RUBY
  end

  # This assertion is for porting x2() tests in testpy.py of Onigmo.
  def assert_match_at(re, str, positions, msg = nil)
    re = Regexp.new(re) unless re.is_a?(Regexp)

    match = re.match(str)

    assert_not_nil match, message(msg) {
      "Expected #{re.inspect} to match #{str.inspect}"
    }

    if match
      actual_positions = (0...match.size).map { |i|
        [match.begin(i), match.end(i)]
      }

      assert_equal positions, actual_positions, message(msg) {
        "Expected #{re.inspect} to match #{str.inspect} at: #{positions.inspect}"
      }
    end
  end

  def assert_match_each(re, conds, msg = nil)
    errs = conds.select {|str, match| match ^ (re =~ str)}
    msg = message(msg) {
      "Expected #{re.inspect} to\n" +
      errs.map {|str, match| "\t#{'not ' unless match}match #{str.inspect}"}.join(",\n")
    }
    assert_empty(errs, msg)
  end
end