Search by post slug in the WP Admin

gistfile1.php

add_filter( 'posts_search', 'jje_search_by_slug', 10, 2 );
/**
 * Add post slugs to admin search for a specific post type
 *
 * Rebuilds the search clauses to include post slugs.
 *
 * @param  string $search
 * @param  WP_Query $query
 * @return string
 */
function jje_search_by_slug( $search, $query ) {
	global $wpdb;

	// Only run if we're in the admin and searching our specific post type
	if ( $query->is_search() && $query->is_admin && 'wire-product' === $query->query_vars['post_type'] ) {
		$search = ''; // We will rebuild the entire clause
		$searchand = '';
		foreach ( $query->query_vars['search_terms'] as $term ) {
			$like = '%' . $wpdb->esc_like( $term ) . '%';
			$search .= $wpdb->prepare( "{$searchand}(($wpdb->posts.post_title LIKE %s) OR ($wpdb->posts.post_content LIKE %s) OR ($wpdb->posts.post_name LIKE %s))", $like, $like, $like );
			$searchand = ' AND ';
		}

		if ( ! empty( $search ) ) {
			$search = " AND ({$search}) ";
			if ( ! is_user_logged_in() )
				$search .= " AND ($wpdb->posts.post_password = '') ";
		}
	}

	return $search;
}

Thanks. Very useful.