Contained in these parentheses is a zero-width joiner: (β)
Basically, add those to whatever you feel that might be filtered out, then remove the parentheses. The content inside the parentheses is invisible, but it screws with regex rules.
They're really trying to repeat the fate of Digg, aren't they? People would advertise the shit out of Reddit in Digg, to encourage users to move. Well - perhaps we should test if history does repeat itself.