Online PHP editor | refs for maDcH

<?php add_filter( 'gform_field_validation', 'validate_phone', 10, 4 ); function validate_phone( $result, $value, $form, $field ) { $pattern = "/^(\+44\s?7\d{3}|$?07\d{3}$|$?01\d{3}$?)\s?\d{3}\s?\d{3}$/"; if ( $field->type == 'phone' && $this->phoneFormat != 'standard' && ! preg_match( $pattern, $value ) ) { $result['is_valid'] = false; $result['message'] = 'Please enter a valid phone number'; } return $result; }