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Message-ID: <4b595a5b-2164-4bf2-af8b-80992eb0a0fe@LBSD.net>
Date: Mon, 10 Jun 2024 05:38:36 +0000
From: Nigel Kukard <nkukard@...D.net>
To: "musl@...ts.openwall.com" <musl@...ts.openwall.com>
Subject: Different results with regex.h between Musl and Libc
Hi there,
I'm wondering if someone could possibly point out what I'm doing wrong here.
I tried searching the mailing list for similar topics, I found some
relating to POSIX regex but none that really dealt with this issue with
extended regex. I also didn't find anything really addressing this on
https://wiki.musl-libc.org/functional-differences-from-glibc.html.
If I missed something I'm terribly sorry.
Musl output (Alpine 3.20), musl-1.2.5-r1...
The input '37' matches the pattern '^([0-9]*)?\.?([0-9]*)?$'
Match 0: 37
Match 1:
Match 2: 37
Glibc output (ArchLinux), glibc 2.39+r52+gf8e4623421-1...
The input '37' matches the pattern '^([0-9]*)?\.?([0-9]*)?$'
Match 0: 37
Match 1: 37
Match 2:
Test code...
/*--------------------*/
#include <stdio.h>
#include <regex.h>
int main() {
const char *pattern = "^([0-9]*)?\\.?([0-9]*)?$";
const char *input = "37";
regex_t regex;
regmatch_t matches[3];
int ret;
ret = regcomp(®ex, pattern, REG_EXTENDED);
if (ret) {
fprintf(stderr, "Could not compile regex\n");
return 1;
}
ret = regexec(®ex, input, 3, matches, 0);
if (!ret) {
printf("The input '%s' matches the pattern '%s'\n", input,
pattern);
for (int i = 0; i < 3; i++) {
if (matches[i].rm_so != -1) {
printf("Match %d: %.*s\n", i, matches[i].rm_eo -
matches[i].rm_so, input + matches[i].rm_so);
}
}
} else if (ret == REG_NOMATCH) {
printf("The input '%s' does not match the pattern '%s'\n",
input, pattern);
} else {
char msgbuf[100];
regerror(ret, ®ex, msgbuf, sizeof(msgbuf));
fprintf(stderr, "Regex match failed: %s\n", msgbuf);
return 1;
}
regfree(®ex);
return 0;
}
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