Username validation

[speedy33417]

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!

[requinix]

You know how you used ^ to mark the beginning of the string? Try using $ to mark the end of it too...