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