[SOLVED] validating username

[ballouta]

Hello

 

I have this expression to validate the username before registration:

 

<?php
if(!preg_match("!^[a-z0-9_~]{1,30}$!i", $uname))
{
        echo "You have entered an invalid username.";
} 
?>

 

It is very important for me that

-spaces are not allowed

-usernames can be only letters  or numbers or alphanumeric no special signs (# % & $ @ etc..)

 

does my expression do all this?!

Many thanks

[waynew]

This works just fine for me: I've taken the min and max lengths out so that you can see where they're placed.

 

$min_length = 1;
$max_length = 10;

if(!eregi("^[a-zA-Z0-9]{".$min_length.",".$max_length."}$",$username)){
   //invalid
}

[ballouta]

Thank you