Hi there!
I want to check if given username consists only of letters of English
alphabet, numbers, or "_".
I can go through the string and check every character.
Wouldn't it be simpler to use regular expressions? How would I do it?
These usernames are OK: _john_, 0123bla, foo
These are wrong: x#y, t&boo, 100%
Thanks for your advice.
zbynek
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