Title says it all.

Some examples for you kind folks.

It's rather undesirable to allow the registration of names such as "------" or "_______", however, we don't seek to blacklist their usage either.

With regexp we could set more specific rules on where and how many times these characters could be used.

E,g, a roleplay server often has very strict rules on which display names to allow. Sometimes it's Firstname_Lastname. Currently there's no way to enforce such format or formats similar to this.

So instead of specifying which characters to allow within display names - allow regexp. Or program a toggle to support both so there's an option for novice and a bit more advanced users.

Thanks.