are different for the generalized regex match.
> A username can only contain alphanumeric characters (letters A-Z, numbers 0-9) with the
> exception of underscores, as noted above. Check to make sure your desired username
> does not contain any symbols, dashes, or spaces.
https://help.twitter.com/en/managing-your-account/x-username-rules
Add a specific if-else regex match for X usernames to take into account
that PeeringDB users are able to have X usernames of less than 4 characters
that are the current minimum our generalized username regexer checks in
the string length match. I.e. We currently accept 4-32. X allows 1-15 in length.
f0a6bb3f33