wp_kses_split()

wp_kses_split( string $content, array[]|string $allowed_html, string[] $allowed_protocols ): string

function wp_kses_split( $content, $allowed_html, $allowed_protocols ) {
	global $pass_allowed_html, $pass_allowed_protocols;

	$pass_allowed_html      = $allowed_html;
	$pass_allowed_protocols = $allowed_protocols;

	$token_pattern = <<<REGEX
~
	(                      # Detect comments of various flavors before attempting to find tags.
		(<!--.*?(-->|))   #  - Normative HTML comments.
		|
		</[^a-zA-Z][^>]*>  #  - Closing tags with invalid tag names.
		|
		<![^>]*>           #  - Invalid markup declaration nodes. Not all invalid nodes
		                   #    are matched so as to avoid breaking legacy behaviors.
	)
	|
	(<[^>]*(>|)|>)        # Tag-like spans of text.
~x
REGEX;
	return preg_replace_callback( $token_pattern, '_wp_kses_split_callback', $content );
}