g10: Fix regexp sanitization.
* g10/trustdb.c (sanitize_regexp): Only escape operators.
To sanitize a regular expression, quoting by backslash should be only
done for defined characters. POSIX defines 12 characters including
dot and backslash.
Quoting other characters is wrong, in two ways; It may build an
operator like: \b, \s, \w when using GNU library. Case ignored match
doesn't work, because quoting lower letter means literally and no
much to upper letter.
- GnuPG-bug-id: T2923
- Co-authored-by: Damien Goutte-Gattat <email@example.com>
- Signed-off-by: NIIBE Yutaka <firstname.lastname@example.org>