validating username

[xXLeighXx2008]

We are creating our own page that is NOT vb powered and we are linking it to a mysql database OUTSIDE vb.

We want to validate our registration page so it does not allow usernames with special characters.. Remember, this is NOT vb powered and will not create the user in vb.

We have been recommended to use the eregi() function but we can't find any tutorials on how to acheive this.

This is simply for a custom php file

Can anyone help?

[MoT3rror]

PHP Code:

if(preg_match('^((?!&#\d+;)[\x20-\x7E])+$', $username'))
{
//username is ASCII characters from 32-127
}
else
{
//username is not valided
} 


You can find more patterns here.

[xXLeighXx2008]

We are using the following code and its not working for us.

PHP Code:

$username = $_POST['username'];
            if(!preg_match('^((?!&#\d+;) [\x20-\x7E])+$', $username)) {
                echo ('That is not a valid username.');
            }
            else {
                die();
            } 


[MoT3rror]

Is there any error or what is happening?

[Opserty]

I see a " " (space) before the opening bracket ([) in the regex (in your code), that wasn't in the code given in post #2.

[xXLeighXx2008]

That was my fault when I copied it over, as it was pasted over MSN messenger and it generated a emoticon.

That wasn't what was pasted into the php file.