Hi Alexander, At Adam's prompting, I've taken a look at this bug. In your test case, the trigger seems to be this part of the check:
\x80-\xF7 We've noticed that splitting this into \x80-\xA0 and \xA1-\xF7 fixes the problem. \xA0, \xA1 is a boundary between character classes: \x80-\xA0 are control characters, and \xA1-x\F7 are printable characters (latin1 punctuation and letters). I'm not sure if it's a feature for mb_ereg() to complain about ranges that span character classes, but I'm inclined to think that you don't actually want control characters to be in your usernames anyway. Even with this change, though, the regexp doesn't seem to work so well with actual multibyte UTF8 chars in the string being compared. -- Steve Langasek postmodern programmer
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