$m in pre_do_shortcode_tag
The documentation for $m is available in the function that the pre_do_shortcode_tag filter gets called in, do_shortcode_tag(): /** * … * @param array $m { * Regular expression match array. * * @type string $0 Entire matched shortcode text. * @type string $1 Optional second opening bracket for escaping shortcodes. * @type string $2 Shortcode … Read more