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