Was just doing a search on this exact issue when I started plugging in some regex myself.
My current AS version 1.7.2
I've read the release notes and appears to have been resolved in 1.8.x. I guess it's time to get on board with the latest release.
Active Social 01.08.00 Release Notes - September 8, 2010
FIX - Resend verification fails.
FIX - Group categories doesn't decode encoded characters properly.
FIX - Member search for account values returns all records when no records are found.
FIX - Profile validation with regular expressions and non-required fields
FIX - Security update for enforcing journal content
FIX - Security update for Gallery
FIX - Security update for Messaging
FIX - GroupInfo tab fails to load when using a custom group type template
Just letting everyone know in case they are having same issue and are on an older AS version.