REGEX( Text ; Expression [ ; [ Replacement ] [ ; Flags ] ] )

REGEX(Text;Expression) extracts the first match of Expression in
Text. If there is no match, #N/A is returned.

REGEX(Text;Expression;Replacement) replaces the first match of
Expression in Text, not extracted. If there is no match, Text is
returned unmodified.

REGEX(Text;Expression;Replacement;"g") replaces all matches of
Expression in Text, not extracted. If there is no match, Text is
returned unmodified.

Change-Id: I9d26a48f40c64a2704d9d07576c8b1b98b2c7b84
Reviewed-on: https://gerrit.libreoffice.org/62545Reviewed-by: Eike Rathke <erack@redhat.com>
Tested-by: Jenkins