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I am using php 5.3 with the php 3 and php 4 book. I've hade to substitute preg_match for eregi. It's working for the first two but not the third test, below. Any suggestions for what's wrong? if (!preg_match("#^[[:alpha:].'-]{4,}$#i", stripslashes(trim($_POST['name'])))) { $problem = TRUE; $message .='<p>Please enter a valid name.</p>'; } if (!preg_match("#^[[:alnum:]][a-z0-9_.-]*@[a-z0-9.-]+\.[a-z]{2,4}$#i", stripslashes(trim($_POST['email'])))) { $problem = TRUE; $message .='<p>Please enter a valid email address.</p>'; } if (!preg_match("#^((http|https|ftp)://)? ([[:alnum:]-])+(\.) ([[:alnum:]]){2,4} ([[:alnum:]/+=%&_.~?-]*)$ #i", stripslashes(trim($_POST['url'])))) { $problem = TRUE; $message .='<p>Please enter a valid URL.</p>'; } I've tried with several values which should be valid URL names.