Validating spaces in Form Input

Hi All, I am trying to validate Form INPUT to ensure that only alphanumeric info is being entered. I am using the following code to do it: if(!eregi("^[[:alnum:]]+$", $string)) { return(false); } The above code works fine with a single word string, however, with input where there are spaces in the string (e.g. a street address), it fails. Does anyone know of a regular expression that will validate alphanumeric strings with spaces? Thanks in advance for any and all help. jeff alerta jalerta@nestworks.com