Alphanumeric Characters

[pengu]

Hi guys.

 

Quick question, couldn't find any examples on php.net.

 

I want to do a check to see if a $variable has alphanumeric characters, if it does not, spit an error at them.

 

<?php				

$team_name = 'hello01';

if (!preg_match('[a-zA-Z0-9]',$team_name))
{
echo "Team Name must contain alphanumeric characters.";
exit();
}
?>

 

This still gives me the error message, can you not use '!' with preg_match?

[afrojojo]

Try this:

if (ereg('[^A-Za-z0-9]', $text)) {
echo "This contains characters other than letters and numbers"; 
} else {   
echo "This contains only letters and numbers";   
}  

[premiso]

Right, let's use a depreciated, or being depreciated function (IE ereg).

 

Here is the corrected preg equivalent:

 

if (preg_match('~[^A-Z0-9]~i', $text)) {
    echo "This has non alpha numeric characters";
}

 

 

[Alex]

Or use ctype_alnum which doesn't have all the overhead of the PCRE engine.

[pengu]

afrojojo - Your way worked.  But it's not how I wanted to handle my errors.

 

Thank you Premiso & AlexWD.

[afrojojo]

I guess I should update that one.

[Ruzzas]

pengu, Not much of a difference but you can use:

 

die("Team Name must contain alphanumeric characters.");

 

instead of echo and exit