Regular expressions

I need help with regular expressions. I need to find the occurrence of characters in a string, however, for simplicity, I would like to list them by "what is allowed". I couldn't get it to work using eregi(), so i devised this little function, but there must be an easier way! - please help $legal_char_class = "[a-zA-Z0-9\.]"; $length = strlen($name); for ($i=0; $i <= $length - 1 ; $i++){ $text_pos = $length - $i; // break up string into array and test each character $name_array[$i] = substr($domain_name, -$text_pos,1); if (!ereg($legal_char_class,$name_array[$i])){ $error = true; } }// end for loop -- Ori Staub ori@_NO_SPAM_chikki.net