lib: fix infinite loop on empty regexp matches in uc_replace()

The regular expression `/()/` will match the empty string, causing the
match loop to never advance. Add extra logic to deal with this case,
similar to the empty separator string logic.

Apply a similar exception to replacements of empty search strings, those
should yield the same result as empty regexp matches.

Signed-off-by: Jo-Philipp Wich <jo@mein.io>

0 files changed, 0 insertions, 0 deletions