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      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 
     30 assertArrayEquals(["f", undefined],
     31                   "foo".match(/(?:(?=(f)o))?f/),
     32                   "zero length match in (?:) with capture in lookahead");
     33 assertArrayEquals(["f", undefined],
     34                   "foo".match(/(?=(f)o)?f/),
     35                   "zero length match in (?=) with capture in lookahead");
     36 assertArrayEquals(["fo", "f"],
     37                   "foo".match(/(?:(?=(f)o)f)?o/),
     38                   "non-zero length match with capture in lookahead");
     39 assertArrayEquals(["fo", "f"],
     40                   "foo".match(/(?:(?=(f)o)f?)?o/),
     41                   "non-zero length match with greedy ? in (?:)");
     42 assertArrayEquals(["fo", "f"],
     43                   "foo".match(/(?:(?=(f)o)f??)?o/),
     44                   "non-zero length match with non-greedy ? in (?:), o forces backtrack");
     45 assertArrayEquals(["fo", "f"],
     46                   "foo".match(/(?:(?=(f)o)f??)?./),
     47                   "non-zero length match with non-greedy ? in (?:), zero length match causes backtrack");
     48 assertArrayEquals(["f", undefined],
     49                   "foo".match(/(?:(?=(f)o)fx)?./),
     50                   "x causes backtrack inside (?:)");
     51