regress-176.js revision 053d10c438f14580aaf4ab1b2aad93a5a4fe8b82 
1// Copyright 2008 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28// See http://code.google.com/p/v8/issues/detail?id=176
29
30assertEquals("f,",
31             "foo".match(/(?:(?=(f)o))?f/).toString(),
32             "zero length match in (?:) with capture in lookahead");
33assertEquals("f,",
34             "foo".match(/(?=(f)o)?f/).toString(),
35             "zero length match in (?=) with capture in lookahead");
36assertEquals("fo,f",
37             "foo".match(/(?:(?=(f)o)f)?o/),
38             "non-zero length match with capture in lookahead");
39assertEquals("fo,f",
40             "foo".match(/(?:(?=(f)o)f?)?o/),
41             "non-zero length match with greedy ? in (?:)");
42assertEquals("fo,f",
43             "foo".match(/(?:(?=(f)o)f??)?o/),
44             "non-zero length match with non-greedy ? in (?:), o forces backtrack");
45assertEquals("fo,f",
46             "foo".match(/(?:(?=(f)o)f??)?./),
47             "non-zero length match with non-greedy ? in (?:), zero length match causes backtrack");
48assertEquals("f,",
49             "foo".match(/(?:(?=(f)o)fx)?./),
50             "x causes backtrack inside (?:)");
51