| // Copyright (C) 2024 Aurèle Barrière. All rights reserved. |
| // This code is governed by the BSD license found in the LICENSE file. |
| |
| /*--- |
| esid: sec-runtime-semantics-repeatmatcher-abstract-operation |
| description: JavaScript nullable quantifiers have special semantics, optional iterations are not allowed to match the empty string. Point 2.b below shows that after each optional (min=0) iteration of a quantifier, if the iteration matched the empty string (y.[[EndIndex]] = x.[[EndIndex]]), then the iteration is discarded. In particular, for (a?b??)* on "ab", it is possible to do two iterations of the star, one matching "a" and the other matching "b". |
| info: | |
| RepeatMatcher ( m, min, max, greedy, x, c, parenIndex, parenCount ) |
| |
| 2. Let d be a new MatcherContinuation with parameters (y) that captures m, min, max, greedy, x, c, parenIndex, and parenCount and performs the following steps when called: |
| |
| b. If min = 0 and y.[[EndIndex]] = x.[[EndIndex]], return failure. |
| author: Aurèle Barrière |
| ---*/ |
| |
| let input = "ab"; |
| let regex = /(a?b??)*/; |
| let match = regex.exec(input); |
| let expected = "ab"; |
| |
| assert.sameValue(match[0], expected, "The regex is expected to match the whole string"); |
