1 files changed, 179 insertions, 0 deletions
diff --git a/spec/ruby/language/regexp/anchors_spec.rb b/spec/ruby/language/regexp/anchors_spec.rb
new file mode 100644
index 0000000000..c6a620a221
--- /dev/null
+++ b/spec/ruby/language/regexp/anchors_spec.rb
@@ -0,0 +1,179 @@
+require File.expand_path('../../../spec_helper', __FILE__)
+require File.expand_path('../../fixtures/classes', __FILE__)
+
+describe "Regexps with anchors" do
+  it "supports ^ (line start anchor)" do
+    # Basic matching
+    /^foo/.match("foo").to_a.should == ["foo"]
+    /^bar/.match("foo\nbar").to_a.should == ["bar"]
+    # Basic non-matching
+    /^foo/.match(" foo").should be_nil
+    /foo^/.match("foo\n\n\n").should be_nil
+
+    # A bit advanced
+    /^^^foo/.match("foo").to_a.should == ["foo"]
+    (/^[^f]/ =~ "foo\n\n").should == "foo\n".size and $~.to_a.should == ["\n"]
+    (/($^)($^)/ =~ "foo\n\n").should == "foo\n".size and $~.to_a.should == ["", "", ""]
+
+    # Different start of line chars
+    /^bar/.match("foo\rbar").should be_nil
+    /^bar/.match("foo\0bar").should be_nil
+
+    # Trivial
+    /^/.match("foo").to_a.should == [""]
+
+    # Grouping
+    /(^foo)/.match("foo").to_a.should == ["foo", "foo"]
+    /(^)/.match("foo").to_a.should == ["", ""]
+    /(foo\n^)(^bar)/.match("foo\nbar").to_a.should == ["foo\nbar", "foo\n", "bar"]
+  end
+
+  it "does not match ^ after trailing \\n" do
+    /^(?!\A)/.match("foo\n").should be_nil # There is no (empty) line after a trailing \n
+  end
+
+  it "supports $ (line end anchor)" do
+    # Basic  matching
+    /foo$/.match("foo").to_a.should == ["foo"]
+    /foo$/.match("foo\nbar").to_a.should == ["foo"]
+    # Basic non-matching
+    /foo$/.match("foo ").should be_nil
+    /$foo/.match("\n\n\nfoo").should be_nil
+
+    # A bit advanced
+    /foo$$$/.match("foo").to_a.should == ["foo"]
+    (/[^o]$/ =~ "foo\n\n").should == ("foo\n".size - 1) and $~.to_a.should == ["\n"]
+
+    # Different end of line chars
+    /foo$/.match("foo\r\nbar").should be_nil
+    /foo$/.match("foo\0bar").should be_nil
+
+    # Trivial
+    (/$/ =~ "foo").should == "foo".size and $~.to_a.should == [""]
+
+    # Grouping
+    /(foo$)/.match("foo").to_a.should == ["foo", "foo"]
+    (/($)/ =~ "foo").should == "foo".size and $~.to_a.should == ["", ""]
+    /(foo$)($\nbar)/.match("foo\nbar").to_a.should == ["foo\nbar", "foo", "\nbar"]
+  end
+
+  it "supports \\A (string start anchor)" do
+    # Basic matching
+    /\Afoo/.match("foo").to_a.should == ["foo"]
+    # Basic non-matching
+    /\Abar/.match("foo\nbar").should be_nil
+    /\Afoo/.match(" foo").should be_nil
+
+    # A bit advanced
+    /\A\A\Afoo/.match("foo").to_a.should == ["foo"]
+    /(\A\Z)(\A\Z)/.match("").to_a.should == ["", "", ""]
+
+    # Different start of line chars
+    /\Abar/.match("foo\0bar").should be_nil
+
+    # Grouping
+    /(\Afoo)/.match("foo").to_a.should == ["foo", "foo"]
+    /(\A)/.match("foo").to_a.should == ["", ""]
+  end
+
+  it "supports \\Z (string end anchor, including before trailing \\n)" do
+    # Basic matching
+    /foo\Z/.match("foo").to_a.should == ["foo"]
+    /foo\Z/.match("foo\n").to_a.should == ["foo"]
+    # Basic non-matching
+    /foo\Z/.match("foo\nbar").should be_nil
+    /foo\Z/.match("foo ").should be_nil
+
+    # A bit advanced
+    /foo\Z\Z\Z/.match("foo\n").to_a.should == ["foo"]
+    (/($\Z)($\Z)/ =~ "foo\n").should == "foo".size and $~.to_a.should == ["", "", ""]
+    (/(\z\Z)(\z\Z)/ =~ "foo\n").should == "foo\n".size and $~.to_a.should == ["", "", ""]
+
+    # Different end of line chars
+    /foo\Z/.match("foo\0bar").should be_nil
+    /foo\Z/.match("foo\r\n").should be_nil
+
+    # Grouping
+    /(foo\Z)/.match("foo").to_a.should == ["foo", "foo"]
+    (/(\Z)/ =~ "foo").should == "foo".size and $~.to_a.should == ["", ""]
+  end
+
+  it "supports \\z (string end anchor)" do
+    # Basic matching
+    /foo\z/.match("foo").to_a.should == ["foo"]
+    # Basic non-matching
+    /foo\z/.match("foo\nbar").should be_nil
+    /foo\z/.match("foo\n").should be_nil
+    /foo\z/.match("foo ").should be_nil
+
+    # A bit advanced
+    /foo\z\z\z/.match("foo").to_a.should == ["foo"]
+    (/($\z)($\z)/ =~ "foo").should == "foo".size and $~.to_a.should == ["", "", ""]
+
+    # Different end of line chars
+    /foo\z/.match("foo\0bar").should be_nil
+    /foo\z/.match("foo\r\nbar").should be_nil
+
+    # Grouping
+    /(foo\z)/.match("foo").to_a.should == ["foo", "foo"]
+    (/(\z)/ =~ "foo").should == "foo".size and $~.to_a.should == ["", ""]
+  end
+
+  it "supports \\b (word boundary)" do
+    # Basic matching
+    /foo\b/.match("foo").to_a.should == ["foo"]
+    /foo\b/.match("foo\n").to_a.should == ["foo"]
+    LanguageSpecs.white_spaces.scan(/./).each do |c|
+    /foo\b/.match("foo" + c).to_a.should == ["foo"]
+    end
+    LanguageSpecs.non_alphanum_non_space.scan(/./).each do |c|
+    /foo\b/.match("foo" + c).to_a.should == ["foo"]
+    end
+    /foo\b/.match("foo\0").to_a.should == ["foo"]
+    # Basic non-matching
+    /foo\b/.match("foobar").should be_nil
+    /foo\b/.match("foo123").should be_nil
+    /foo\b/.match("foo_").should be_nil
+  end
+
+  it "supports \\B (non-word-boundary)" do
+    # Basic matching
+    /foo\B/.match("foobar").to_a.should == ["foo"]
+    /foo\B/.match("foo123").to_a.should == ["foo"]
+    /foo\B/.match("foo_").to_a.should == ["foo"]
+    # Basic non-matching
+    /foo\B/.match("foo").should be_nil
+    /foo\B/.match("foo\n").should be_nil
+    LanguageSpecs.white_spaces.scan(/./).each do |c|
+    /foo\B/.match("foo" + c).should be_nil
+    end
+    LanguageSpecs.non_alphanum_non_space.scan(/./).each do |c|
+    /foo\B/.match("foo" + c).should be_nil
+    end
+    /foo\B/.match("foo\0").should be_nil
+  end
+
+  it "supports (?= ) (positive lookahead)" do
+    /foo.(?=bar)/.match("foo1 foo2bar").to_a.should == ["foo2"]
+  end
+
+  it "supports (?! ) (negative lookahead)" do
+    /foo.(?!bar)/.match("foo1bar foo2").to_a.should == ["foo2"]
+  end
+
+  it "supports (?!<) (negative lookbehind)" do
+    /(?<!foo)bar./.match("foobar1 bar2").to_a.should == ["bar2"]
+  end
+
+  it "supports (?<=) (positive lookbehind)" do
+    /(?<=foo)bar./.match("bar1 foobar2").to_a.should == ["bar2"]
+  end
+
+  it "supports (?<=\\b) (positive lookbehind with word boundary)" do
+    /(?<=\bfoo)bar./.match("1foobar1 foobar2").to_a.should == ["bar2"]
+  end
+
+  it "supports (?!<\\b) (negative lookbehind with word boundary)" do
+    /(?<!\bfoo)bar./.match("foobar1 1foobar2").to_a.should == ["bar2"]
+  end
+end