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regexp: fix non greedy quantizers with zero length matches

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Cherry-picked from:
36911f0d3a
This commit is contained in:
Fabrice Bellard 2024-05-30 16:41:37 +02:00 committed by Saúl Ibarra Corretgé
parent 763010663b
commit 009a60218f
2 changed files with 10 additions and 4 deletions
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10
libregexp.c
View file

@ -1633,11 +1633,13 @@ static int re_parse_term(REParseState *s, BOOL is_backward_dir)
if (dbuf_error(&s->byte_code))
goto out_of_memory;
add_zero_advance_check = (re_check_advance(s->byte_code.buf + last_atom_start,
s->byte_code.size - last_atom_start) == 0);
} else {
add_zero_advance_check = FALSE;
}
/* the spec tells that if there is no advance when
running the atom after the first quant_min times,
then there is no match. We remove this test when we
are sure the atom always advances the position. */
add_zero_advance_check = (re_check_advance(s->byte_code.buf + last_atom_start,
s->byte_code.size - last_atom_start) == 0);
{
int len, pos;

4
tests/test_builtin.js
View file

@ -768,6 +768,10 @@ function test_regexp()
eval("/[\\-]/");
eval("/[\\-]/u");
/* test zero length matches */
a = /()*?a/.exec(",");
assert(a, null);
}
function test_symbol()