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My username validation works on these principals:

 

First letter must be alphanumerical

All other letters must be alphanumerical plus space and -_.

 

I use the following code

 

if (preg_match('/^[A-Za-z0-9][A-Za-z0-9-_.\s]/',$username))

...

 

The problem is that it validates this:

 

xxxxx™

 

How can I make sure that my username does not accept trademark sign and similar characters?

 

Thank you!

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https://forums.phpfreaks.com/topic/221362-username-validation/
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