Add regular expression validation for custom titles

[b94]

There is a "Disallowed Custom Titles" blacklist, but it doesn't work well as there is a near infinite number of permutations that use similar looking unicode characters. Users can exploit this to impersonate moderators, pretend to be banned etc.

Would it be possible for this to be expanded to have regex validation in addition to the blacklist, like with user name validation?

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