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require_relative '../../spec_helper'
require_relative '../fixtures/classes'
describe "Regexps with repetition" do
it "supports * (0 or more of previous subexpression)" do
/a*/.match("aaa").to_a.should == ["aaa"]
/a*/.match("bbb").to_a.should == [""]
/<.*>/.match("<a>foo</a>").to_a.should == ["<a>foo</a>"] # it is greedy
end
it "supports *? (0 or more of previous subexpression - lazy)" do
/a*?/.match("aaa").to_a.should == [""]
/<.*?>/.match("<a>foo</a>").to_a.should == ["<a>"]
end
it "supports + (1 or more of previous subexpression)" do
/a+/.match("aaa").to_a.should == ["aaa"]
/a+/.match("bbb").should be_nil
/<.+>/.match("<a>foo</a>").to_a.should == ["<a>foo</a>"] # it is greedy
end
it "supports +? (0 or more of previous subexpression - lazy)" do
/a+?/.match("aaa").to_a.should == ["a"]
/<.+?>/.match("<a>foo</a>").to_a.should == ["<a>"]
end
it "supports {m,n} (m to n of previous subexpression)" do
/a{2,4}/.match("aaaaaa").to_a.should == ["aaaa"]
/<.{1,}>/.match("<a>foo</a>").to_a.should == ["<a>foo</a>"] # it is greedy
end
it "supports {m,n}? (m to n of previous subexpression) - lazy)" do
/<.{1,}?>/.match("<a>foo</a>").to_a.should == ["<a>"]
/.([0-9]){3,5}?foo/.match("9876543210foo").to_a.should == ["543210foo", "0"]
end
it "does not treat {m,n}+ as possessive" do
-> {
@regexp = eval "/foo(A{0,1}+)Abar/"
}.should complain(/nested repeat operator/)
@regexp.match("fooAAAbar").to_a.should == ["fooAAAbar", "AA"]
end
it "supports ? (0 or 1 of previous subexpression)" do
/a?/.match("aaa").to_a.should == ["a"]
/a?/.match("bbb").to_a.should == [""]
end
end
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