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WP_Rewrite::add_external_rule( string $regex, string $query )

Adds a rewrite rule that doesn’t correspond to index.php.

$regex: (string) (Required) Regular expression to match request against.
$query: (string) (Required) The corresponding query vars for this rewrite rule.

public function add_external_rule( $regex, $query ) {
		$this->non_wp_rules[ $regex ] = $query;
	}

Used By	Description
wp-includes/class-wp-rewrite.php: WP_Rewrite::add_rule()	Adds a rewrite rule that transforms a URL structure to a set of query vars.

Version	Description
2.1.0	Introduced.