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I'm trying to create a field that will validation US phone numbers, and afterwards I will be attempting a field to validate income. So far, for the phone numbers, I have implemented the following regex expression and PHP. The regex has worked in someone elses implementation, however when I utilize it in this implementation it always returns an error that the phone number isn't valid. I'm having a difficult time seeing where the difficulty is: //1. Add a new form element... add_action('register_form','myplugin_register_form2'); function myplugin_register_form2 (){ $phone_number = ( isset( $_POST['phone_number'] ) ) ? $_POST['phone_number']: ''; ?> <p id="phone_number"> <label for="phone_number"><?php _e('Phone Number <font size="1">(XXX XXX XXXX)</font>','mydomain') ?><br /> <input type="text" name="phone_number" id="phone_number" class="input" size="25" style="text-align:right" maxlength="14" /> </p> <?php } //2. Add validation. In this case, we make sure phone_number is required. add_filter('registration_errors', 'myplugin_registration_errors2', 10, 3); function myplugin_registration_errors2 ($errors, $sanitized_user_login, $user_email) { $sPattern = "/^ (?: # Area Code (?: \( # Open Parentheses (?=\d{3}\)) # Lookahead. Only if we have 3 digits and a closing parentheses )? (\d{3}) # 3 Digit area code (?: (?<=\(\d{3}) # Closing Parentheses. Lookbehind. \) # Only if we have an open parentheses and 3 digits )? [\s.\/-]? # Optional Space Delimeter )? (\d{3}) # 3 Digits [\s\.\/-]? # Optional Space Delimeter (\d{4})\s? # 4 Digits and an Optional following Space (?: # Extension (?: # Lets look for some variation of 'extension' (?: (?:e|x|ex|ext)\.? # First, abbreviations, with an optional following period | extension # Now just the whole word ) \s? # Optionsal Following Space ) (?=\d+) # This is the Lookahead. Only accept that previous section IF it's followed by some digits. (\d+) # Now grab the actual digits (the lookahead doesn't grab them) )? # The Extension is Optional $/x"; // /x modifier allows the expanded and commented regex $aNumbers = array( '123-456-7890x123', '123.456.7890x123', '123 456 7890 x123', '(123) 456-7890 x123', '123.456.7890x.123', '123.456.7890 ext. 123', '123.456.7890 extension 123456', '123 456 7890', '123-456-7890ex123', '123.456.7890 ex123', '123 456 7890 ext123', '456-7890', '456 7890', '456 7890 x123', '1234567890', '() 456 7890' ); foreach($aNumbers as $sNumber) { if (!preg_match($sPattern, $phone_number, $aMatches)) { $errors->add( 'phone_number_error', __('<strong>ERROR</strong>: You must include a valid phone number.','mydomain') ); return $errors; } } if ( empty( $_POST['phone_number'] ) ) $errors->add( 'phone_number_error', __('<strong>ERROR</strong>: You must include a valid phone number.','mydomain') ); return $errors; } //3. Finally, save our extra registration user meta. add_action('user_register', 'myplugin_user_register2'); function myplugin_user_register2 ($user_id) { if ( isset( $_POST['phone_number'] ) ) update_user_meta($user_id, 'phone_number', $_POST['phone_number']); }