wp_kses_html_error

Handles parsing errors in `wp_kses_hair()`.

The general plan is to remove everything to and including some whitespace,
but it deals with quotes and apostrophes as well.

function wp_kses_html_error( $string ) {
	return preg_replace( '/^("[^"]*("|$)|'[^']*('|$)|S)*s*/', '', $string );
}