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3e6337b88b
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@65388 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
53 lines
1.5 KiB
Ruby
53 lines
1.5 KiB
Ruby
require_relative '../../spec_helper'
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require_relative '../fixtures/classes'
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describe "Regexps with back-references" do
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it "saves match data in the $~ pseudo-global variable" do
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"hello" =~ /l+/
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$~.to_a.should == ["ll"]
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end
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it "saves captures in numbered $[1-N] variables" do
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"1234567890" =~ /(1)(2)(3)(4)(5)(6)(7)(8)(9)(0)/
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$~.to_a.should == ["1234567890", "1", "2", "3", "4", "5", "6", "7", "8", "9", "0"]
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$1.should == "1"
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$2.should == "2"
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$3.should == "3"
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$4.should == "4"
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$5.should == "5"
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$6.should == "6"
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$7.should == "7"
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$8.should == "8"
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$9.should == "9"
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$10.should == "0"
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end
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it "will not clobber capture variables across threads" do
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cap1, cap2, cap3 = nil
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"foo" =~ /(o+)/
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cap1 = [$~.to_a, $1]
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Thread.new do
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cap2 = [$~.to_a, $1]
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"bar" =~ /(a)/
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cap3 = [$~.to_a, $1]
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end.join
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cap4 = [$~.to_a, $1]
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cap1.should == [["oo", "oo"], "oo"]
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cap2.should == [[], nil]
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cap3.should == [["a", "a"], "a"]
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cap4.should == [["oo", "oo"], "oo"]
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end
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it "supports \<n> (backreference to previous group match)" do
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/(foo.)\1/.match("foo1foo1").to_a.should == ["foo1foo1", "foo1"]
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/(foo.)\1/.match("foo1foo2").should be_nil
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end
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it "resets nested \<n> backreference before match of outer subexpression" do
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/(a\1?){2}/.match("aaaa").to_a.should == ["aa", "a"]
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end
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it "can match an optional quote, followed by content, followed by a matching quote, as the whole string" do
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/^("|)(.*)\1$/.match('x').to_a.should == ["x", "", "x"]
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end
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end
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