require_relative '../../spec_helper' require_relative '../fixtures/classes' describe "Regexps with back-references" do it "saves match data in the $~ pseudo-global variable" do "hello" =~ /l+/ $~.to_a.should == ["ll"] end it "saves captures in numbered $[1-N] variables" do "1234567890" =~ /(1)(2)(3)(4)(5)(6)(7)(8)(9)(0)/ $~.to_a.should == ["1234567890", "1", "2", "3", "4", "5", "6", "7", "8", "9", "0"] $1.should == "1" $2.should == "2" $3.should == "3" $4.should == "4" $5.should == "5" $6.should == "6" $7.should == "7" $8.should == "8" $9.should == "9" $10.should == "0" end it "will not clobber capture variables across threads" do cap1, cap2, cap3 = nil "foo" =~ /(o+)/ cap1 = [$~.to_a, $1] Thread.new do cap2 = [$~.to_a, $1] "bar" =~ /(a)/ cap3 = [$~.to_a, $1] end.join cap4 = [$~.to_a, $1] cap1.should == [["oo", "oo"], "oo"] cap2.should == [[], nil] cap3.should == [["a", "a"], "a"] cap4.should == [["oo", "oo"], "oo"] end it "supports \ (backreference to previous group match)" do /(foo.)\1/.match("foo1foo1").to_a.should == ["foo1foo1", "foo1"] /(foo.)\1/.match("foo1foo2").should be_nil end it "resets nested \ backreference before match of outer subexpression" do /(a\1?){2}/.match("aaaa").to_a.should == ["aa", "a"] end end