Re: Check for characters other than letters and numbers (for username)

In article <935r6q$c67$1@toye.p.sourceforge.net>, jaydub@bossanova.com ("Jeff Warrington") wrote: > > is there a simple function to check for characters other than letters > > and numbers? i'd like to verify a username is valid when they register. > ereg("[a-zA-Z0-9]+",$string) > > or > > ereg("[[:alpha:][:digit:]]+",$string) > or > ereg("[[:alnum:]]+",$string) Of course what that checks is whether the string contain one or more characters that *are letters or numbers. If the goal is to check whether the string contains one or more of characters other than those, perhaps something like: if(ereg([^a-zA-Z0-9]",$string)) {echo "Try again!";} would be preferrable. -- CC