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require_relative '../../spec_helper'
require_relative '../fixtures/classes'
describe "Regexps with anchors" do
it "supports ^ (line start anchor)" do
# Basic matching
/^foo/.match("foo").to_a.should == ["foo"]
/^bar/.match("foo\nbar").to_a.should == ["bar"]
# Basic non-matching
/^foo/.match(" foo").should be_nil
/foo^/.match("foo\n\n\n").should be_nil
# A bit advanced
/^^^foo/.match("foo").to_a.should == ["foo"]
(/^[^f]/ =~ "foo\n\n").should == "foo\n".size and $~.to_a.should == ["\n"]
(/($^)($^)/ =~ "foo\n\n").should == "foo\n".size and $~.to_a.should == ["", "", ""]
# Different start of line chars
/^bar/.match("foo\rbar").should be_nil
/^bar/.match("foo\0bar").should be_nil
# Trivial
/^/.match("foo").to_a.should == [""]
# Grouping
/(^foo)/.match("foo").to_a.should == ["foo", "foo"]
/(^)/.match("foo").to_a.should == ["", ""]
/(foo\n^)(^bar)/.match("foo\nbar").to_a.should == ["foo\nbar", "foo\n", "bar"]
end
it "does not match ^ after trailing \\n" do
/^(?!\A)/.match("foo\n").should be_nil # There is no (empty) line after a trailing \n
end
it "supports $ (line end anchor)" do
# Basic matching
/foo$/.match("foo").to_a.should == ["foo"]
/foo$/.match("foo\nbar").to_a.should == ["foo"]
# Basic non-matching
/foo$/.match("foo ").should be_nil
/$foo/.match("\n\n\nfoo").should be_nil
# A bit advanced
/foo$$$/.match("foo").to_a.should == ["foo"]
(/[^o]$/ =~ "foo\n\n").should == ("foo\n".size - 1) and $~.to_a.should == ["\n"]
# Different end of line chars
/foo$/.match("foo\r\nbar").should be_nil
/foo$/.match("foo\0bar").should be_nil
# Trivial
(/$/ =~ "foo").should == "foo".size and $~.to_a.should == [""]
# Grouping
/(foo$)/.match("foo").to_a.should == ["foo", "foo"]
(/($)/ =~ "foo").should == "foo".size and $~.to_a.should == ["", ""]
/(foo$)($\nbar)/.match("foo\nbar").to_a.should == ["foo\nbar", "foo", "\nbar"]
end
it "supports \\A (string start anchor)" do
# Basic matching
/\Afoo/.match("foo").to_a.should == ["foo"]
# Basic non-matching
/\Abar/.match("foo\nbar").should be_nil
/\Afoo/.match(" foo").should be_nil
# A bit advanced
/\A\A\Afoo/.match("foo").to_a.should == ["foo"]
/(\A\Z)(\A\Z)/.match("").to_a.should == ["", "", ""]
# Different start of line chars
/\Abar/.match("foo\0bar").should be_nil
# Grouping
/(\Afoo)/.match("foo").to_a.should == ["foo", "foo"]
/(\A)/.match("foo").to_a.should == ["", ""]
end
it "supports \\Z (string end anchor, including before trailing \\n)" do
# Basic matching
/foo\Z/.match("foo").to_a.should == ["foo"]
/foo\Z/.match("foo\n").to_a.should == ["foo"]
# Basic non-matching
/foo\Z/.match("foo\nbar").should be_nil
/foo\Z/.match("foo ").should be_nil
# A bit advanced
/foo\Z\Z\Z/.match("foo\n").to_a.should == ["foo"]
(/($\Z)($\Z)/ =~ "foo\n").should == "foo".size and $~.to_a.should == ["", "", ""]
(/(\z\Z)(\z\Z)/ =~ "foo\n").should == "foo\n".size and $~.to_a.should == ["", "", ""]
# Different end of line chars
/foo\Z/.match("foo\0bar").should be_nil
/foo\Z/.match("foo\r\n").should be_nil
# Grouping
/(foo\Z)/.match("foo").to_a.should == ["foo", "foo"]
(/(\Z)/ =~ "foo").should == "foo".size and $~.to_a.should == ["", ""]
end
it "supports \\z (string end anchor)" do
# Basic matching
/foo\z/.match("foo").to_a.should == ["foo"]
# Basic non-matching
/foo\z/.match("foo\nbar").should be_nil
/foo\z/.match("foo\n").should be_nil
/foo\z/.match("foo ").should be_nil
# A bit advanced
/foo\z\z\z/.match("foo").to_a.should == ["foo"]
(/($\z)($\z)/ =~ "foo").should == "foo".size and $~.to_a.should == ["", "", ""]
# Different end of line chars
/foo\z/.match("foo\0bar").should be_nil
/foo\z/.match("foo\r\nbar").should be_nil
# Grouping
/(foo\z)/.match("foo").to_a.should == ["foo", "foo"]
(/(\z)/ =~ "foo").should == "foo".size and $~.to_a.should == ["", ""]
end
it "supports \\b (word boundary)" do
# Basic matching
/foo\b/.match("foo").to_a.should == ["foo"]
/foo\b/.match("foo\n").to_a.should == ["foo"]
LanguageSpecs.white_spaces.scan(/./).each do |c|
/foo\b/.match("foo" + c).to_a.should == ["foo"]
end
LanguageSpecs.non_alphanum_non_space.scan(/./).each do |c|
/foo\b/.match("foo" + c).to_a.should == ["foo"]
end
/foo\b/.match("foo\0").to_a.should == ["foo"]
# Basic non-matching
/foo\b/.match("foobar").should be_nil
/foo\b/.match("foo123").should be_nil
/foo\b/.match("foo_").should be_nil
end
it "supports \\B (non-word-boundary)" do
# Basic matching
/foo\B/.match("foobar").to_a.should == ["foo"]
/foo\B/.match("foo123").to_a.should == ["foo"]
/foo\B/.match("foo_").to_a.should == ["foo"]
# Basic non-matching
/foo\B/.match("foo").should be_nil
/foo\B/.match("foo\n").should be_nil
LanguageSpecs.white_spaces.scan(/./).each do |c|
/foo\B/.match("foo" + c).should be_nil
end
LanguageSpecs.non_alphanum_non_space.scan(/./).each do |c|
/foo\B/.match("foo" + c).should be_nil
end
/foo\B/.match("foo\0").should be_nil
end
it "supports (?= ) (positive lookahead)" do
/foo.(?=bar)/.match("foo1 foo2bar").to_a.should == ["foo2"]
end
it "supports (?! ) (negative lookahead)" do
/foo.(?!bar)/.match("foo1bar foo2").to_a.should == ["foo2"]
end
it "supports (?!<) (negative lookbehind)" do
/(?<!foo)bar./.match("foobar1 bar2").to_a.should == ["bar2"]
end
it "supports (?<=) (positive lookbehind)" do
/(?<=foo)bar./.match("bar1 foobar2").to_a.should == ["bar2"]
end
it "supports (?<=\\b) (positive lookbehind with word boundary)" do
/(?<=\bfoo)bar./.match("1foobar1 foobar2").to_a.should == ["bar2"]
end
it "supports (?!<\\b) (negative lookbehind with word boundary)" do
/(?<!\bfoo)bar./.match("foobar1 1foobar2").to_a.should == ["bar2"]
end
end
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