- if ( 0 !== preg_match( '@[<>&/\[\]\x00-\x20]@', $tag ) ) {
- /* translators: %s: shortcode name */
- $message = sprintf( __( 'Invalid shortcode name: %s. Do not use spaces or reserved characters: & / < > [ ]' ), $tag );
+ if ( 0 !== preg_match( '@[<>&/\[\]\x00-\x20=]@', $tag ) ) {
+ /* translators: 1: shortcode name, 2: space separated list of reserved characters */
+ $message = sprintf( __( 'Invalid shortcode name: %1$s. Do not use spaces or reserved characters: %2$s' ), $tag, '& / < > [ ] =' );