2 replies to this topic

[Bioshox]

Hey guy's

I need a piece of code that validates a username so it's only allowed lower case letters, numbers, underscores and dashes.

No spaces, dots ect.

Thank's!

[WingedPanther]

You could use a regular expression: ^[a-z0-9_-]*$

[webcodez]

Yep, WingedPanther is right. If you're not sure how to use the regular expression, here's an example using preg_match :

<?php
$username = "some_username"; //e.g. $_POST['username'] 
 
if(preg_match("/^[a-z0-9_-]*$/", $username)) {
 
   //Valid username
 
}else{
 
   //Invalid username
 
}

?>