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regexp: fix non greedy quantizers with zero length matches

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This commit is contained in:
Fabrice Bellard 2024-05-30 16:41:37 +02:00
parent d86aaf0b8f
commit 36911f0d3a
2 changed files with 8 additions and 8 deletions
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14
libregexp.c
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@ -1488,15 +1488,13 @@ static int re_parse_term(REParseState *s, BOOL is_backward_dir)
if (dbuf_error(&s->byte_code)) if (dbuf_error(&s->byte_code))
goto out_of_memory; goto out_of_memory;
/* 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_need_check_advance(s->byte_code.buf + last_atom_start,
s->byte_code.size - last_atom_start);
} 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_need_check_advance(s->byte_code.buf + last_atom_start,
s->byte_code.size - last_atom_start);
{ {
int len, pos; int len, pos;

2
tests/test_builtin.js
View file

@ -678,6 +678,8 @@ function test_regexp()
assert(a, ["a", undefined]); assert(a, ["a", undefined]);
a = /(?:|[\w])+([0-9])/.exec("123a23"); a = /(?:|[\w])+([0-9])/.exec("123a23");
assert(a, ["123a23", "3"]); assert(a, ["123a23", "3"]);
a = /()*?a/.exec(",");
assert(a, null);
} }
function test_symbol() function test_symbol()