captures.js (1658B)
1 // Copyright (C) 2017 the V8 project authors. All rights reserved. 2 // This code is governed by the BSD license found in the LICENSE file. 3 4 /*--- 5 esid: sec-assertion 6 description: > 7 Capturing matches 8 info: | 9 The production Assertion :: (?<=Disjunction) evaluates as follows: 10 1. Evaluate Disjunction with -1 as its direction argument to obtain a Matcher m. 11 2. Return an internal Matcher closure that takes two arguments, a State x and a Continuation 12 c, and performs the following steps: 13 a. Let d be a Continuation that always returns its State argument as a successful MatchResult. 14 b. Call m(x, d) and let r be its result. 15 c. If r is failure, return failure. 16 d. Let y be r's State. 17 e. Let cap be y's captures List. 18 f. Let xe be x's endIndex. 19 g. Let z be the State (xe, cap). 20 h. Call c(z) and return its result. 21 features: [regexp-lookbehind] 22 includes: [compareArray.js] 23 ---*/ 24 25 var str = "abcdef"; 26 assert.compareArray(str.match(/(?<=(c))def/), ["def", "c"], "#1"); 27 assert.compareArray(str.match(/(?<=(\w{2}))def/), ["def", "bc"], "#2"); 28 assert.compareArray(str.match(/(?<=(\w(\w)))def/), ["def", "bc", "c"], "#3"); 29 assert.compareArray(str.match(/(?<=(\w){3})def/), ["def", "a"], "#4"); 30 assert.compareArray(str.match(/(?<=(bc)|(cd))./), ["d", "bc", undefined], "#5"); 31 assert.compareArray(str.match(/(?<=([ab]{1,2})\D|(abc))\w/), ["c", "a", undefined], "#6"); 32 assert.compareArray(str.match(/\D(?<=([ab]+))(\w)/), ["ab", "a", "b"], "#7"); 33 assert.compareArray(str.match(/(?<=b|c)\w/g), ["c", "d"], "#8"); 34 assert.compareArray(str.match(/(?<=[b-e])\w{2}/g), ["cd", "ef"], "#9"); 35 36 reportCompare(0, 0);