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Date: Fri, 26 Nov 2021 11:32:24 -0500
From: Alex Xu <alex@alxu.ca>
To: "Quesada Gonzalez, Elena" <elena.quesada_gonzalez@siemens.com>
Cc: musl@lists.openwall.com
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Subject: RE: [musl] SIGSEV error when using REGEX with musl library

Excerpts from Quesada Gonzalez, Elena's message of November 26, 2021 6:46 a=
m:
> Hi,=20
>=20
> A simple main with the following code, should replicate the error.
>=20
> #include <regex>
> void main()
> {
>=20
>     std::regex regexp("^[a-z0-9]{1,8}$");
>     std::string s =3D ("0xAz10145274");
>     if (false =3D=3D std::regex_search(s, regexp))
>      {
>          // Only fatal. Statement is not initialized yet.
>          printf("Invalid regex [%s]\n", __FUNCTION__);
>        exit(1);
>       }
>     else {
>           printf("Regex ok [%s]\n", __FUNCTION__);
>     }
> }
>=20
> Thanks for your time

This program does not compile.

test.cpp:2:1: error: '::main' must return 'int'
    2 | void main()
      | ^~~~

After adjusting it to return int, it printed "Invalid regex [main]"=20
under both glibc and musl. After removing the anchors, it printed "Regex=20
ok [main]" under both glibc and musl.