Hi,

On Thu, Jun 28, Jarno Huuskonen wrote:
> I think this is the commit that breaks map_regm in this case:
> b5997f740b21ebb197e10a0f2fe9dc13163e1772 (MAJOR: threads/map: Make
> acls/maps thread safe).
> 
> If I revert this commit from pattern.c:pattern_exec_match
> then the map_regm \1 backref seems to work.

I think I found what's replacing the \000 as first char:
in (map.c) sample_conv_map:
            /* In the regm case, merge the sample with the input. */
            if ((long)private == PAT_MATCH_REGM) {
                str = get_trash_chunk();
                str->len = exp_replace(str->str, str->size, smp->data.u.str.str,
                                       pat->data->u.str.str,
                                       (regmatch_t *)smp->ctx.a[0]);

Before call to get_trash_chunk() smp->data.u.str.str is for example
'distri.com' and after get_trash_chunk() smp->data.u.str.str
is '\000istri.com'.

At the moment I don't have time to dig deeper, but hopefully this
helps a little bit.

-Jarno

-- 
Jarno Huuskonen

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