Checking string for alphaumeric

[joecooper]

Hi,

 

Im trying to check if this string only contains a-z A-Z and 0-9, but i am not sure it works

 

if(preg_match("/(A-Z][a-z][0-9]/", $payoutaddress)){
              echo("Address not valid!");
            }else{

}

 

It will always process the else. but even with other characters it will do the same

[Maq]

Why don't you just use - http://www.php.net/manual/en/function.ctype-alnum.php

[skwap]

take this example.

 

<?php

$string = "abcd"; // the data you want to validate.

if(ctype_alnum($string)) // checking if the string contain alpha numeric characters.
{
echo "Success"; // do something what you want.
}
else {
echo "Error"; // do something.
}
?>

;

 

[codefossa]

As said, you can use alnum but just so you know, the regex would be more like '/[^a-z0-9]/i' and if it matches, it's not alphanumeric, and if it returns false, then it is.

[joecooper]

thanks thats working!