https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102480
Bug ID: 102480
Summary: std::regex fails to match ^ when match_prev_avail is
used
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
Assignee: unassigned at gcc dot gnu.org
Reporter: redi at gcc dot gnu.org
Blocks: 102445
Target Milestone: ---
#include <regex>
#include <cassert>
int main() {
char str[] = "\na";
std::regex re("^a");
assert(std::regex_match(str + 1, str + 2, re));
using std::regex_constants::match_prev_avail;
assert(std::regex_match(str + 1, str + 2, re, match_prev_avail));
}
Both assertions should pass.
For the first match, the regex matches at the beginning of the input.
For the second match, the regex should also match because the previous
character is a line terminator.
Referenced Bugs:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102445
[Bug 102445] [meta-bug] std::regex issues
