_get_wptexturize_split_regex() │ WP 4.4.0

Retrieves the combined regular expression for HTML and shortcodes.

Internal function — this function is designed to be used by the kernel itself. It is not recommended to use this function in your code.

No Hooks.

Returns

String. The regular expression.

Usage

_get_wptexturize_split_regex( $shortcode_regex );
$shortcode_regex(string)
The result from _get_wptexturize_shortcode_regex().
Default: ''

Changelog

Since 4.4.0 Introduced.

_get_wptexturize_split_regex() code WP 6.9.1

wp-includes/formatting.php 
function _get_wptexturize_split_regex( $shortcode_regex = '' ) {
	static $html_regex;

	if ( ! isset( $html_regex ) ) {
		// phpcs:disable Squiz.Strings.ConcatenationSpacing.PaddingFound -- don't remove regex indentation
		$comment_regex =
			'!'             // Start of comment, after the <.
			. '(?:'         // Unroll the loop: Consume everything until --> is found.
			.     '-(?!->)' // Dash not followed by end of comment.
			.     '[^\-]*+' // Consume non-dashes.
			. ')*+'         // Loop possessively.
			. '(?:-->)?';   // End of comment. If not found, match all input.

		$html_regex = // Needs replaced with wp_html_split() per Shortcode API Roadmap.
			'<'                  // Find start of element.
			. '(?(?=!--)'        // Is this a comment?
			.     $comment_regex // Find end of comment.
			. '|'
			.     '[^>]*>?'      // Find end of element. If not found, match all input.
			. ')';
		// phpcs:enable
	}

	if ( empty( $shortcode_regex ) ) {
		$regex = '/(' . $html_regex . ')/';
	} else {
		$regex = '/(' . $html_regex . '|' . $shortcode_regex . ')/';
	}

	return $regex;
}