CB

Field REGEXP only accepts / delimiter and won't allow custom delimiters due to the preg_match( "#^/(?:\\\\/|[^/\\n\\r])+/[a-z]*\$#", $pregExp ). I believe it's safe to simply remove this. Invalid REGEXP will simply error as it should instead of not working at all.

https://www.joomlapolis.com/forum/153-professional-member-support/231670-web-address-validation?start=6