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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, $1]
cap1.should == [["oo", "oo"], "oo"]
cap2.should == [[], nil]
cap3.should == [["a", "a"], "a"]
cap4.should == [["oo", "oo"], "oo"]
end
it "supports \<n> (backreference to previous group match)" do
/(foo.)\1/.match("foo1foo1").to_a.should == ["foo1foo1", "foo1"]
/(foo.)\1/.match("foo1foo2").should be_nil
end
it "resets nested \<n> backreference before match of outer subexpression" do
/(a\1?){2}/.match("aaaa").to_a.should == ["aa", "a"]
end
it "can match an optional quote, followed by content, followed by a matching quote, as the whole string" do
/^("|)(.*)\1$/.match('x').to_a.should == ["x", "", "x"]
end
end
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