| // Copyright (C) 2017 the V8 project authors. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-assertion |
| description: > |
| Captures inside negative lookbehind. (They never capture.) |
| info: | |
| The production Assertion :: (?<=Disjunction) evaluates as follows: |
| 1. Evaluate Disjunction with -1 as its direction argument to obtain a Matcher m. |
| 2. Return an internal Matcher closure that takes two arguments, a State x and a Continuation |
| c, and performs the following steps: |
| a. Let d be a Continuation that always returns its State argument as a successful MatchResult. |
| b. Call m(x, d) and let r be its result. |
| c. If r is failure, return failure. |
| d. Let y be r's State. |
| e. Let cap be y's captures List. |
| f. Let xe be x's endIndex. |
| g. Let z be the State (xe, cap). |
| h. Call c(z) and return its result. |
| features: [regexp-lookbehind] |
| includes: [compareArray.js] |
| ---*/ |
| |
| assert.compareArray("abcdef".match(/(?<!(^|[ab]))\w{2}/), ["de", undefined]); |
