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Restore previous group start after a failed non-capturing group (#4002)

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Fixes #3934.

JerryScript-DCO-1.0-Signed-off-by: Dániel Bátyai daniel.batyai@h-lab.eu
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Dániel Bátyai 2020-07-20 12:47:45 +02:00 committed by GitHub
parent f6cde17bfb
commit c2bfdde806
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2 changed files with 21 additions and 0 deletions
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2
jerry-core/ecma/operations/ecma-regexp-object.c
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@ -694,6 +694,7 @@ ecma_regexp_run (ecma_regexp_ctx_t *re_ctx_p, /**< RegExp matcher context */
group_p->subcapture_start = re_get_value (&bc_p);
group_p->subcapture_count = re_get_value (&bc_p);
const lit_utf8_byte_t *const saved_begin_p = group_p->begin_p;
const uint32_t saved_iterator = group_p->iterator;
const uint32_t qmin = re_get_value (&bc_p);
@ -720,6 +721,7 @@ ecma_regexp_run (ecma_regexp_ctx_t *re_ctx_p, /**< RegExp matcher context */
if (matched_p == NULL)
{
group_p->begin_p = saved_begin_p;
goto fail;
}

19
tests/jerry/regression-test-issue-3934.js Normal file
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@ -0,0 +1,19 @@
// Copyright JS Foundation and other contributors, http://js.foundation
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
var r = /(?:(?:^b?)*)*a/.exec("bbba")
assert (r !== null);
assert (r.index === 3);
assert (r[0] === "a");