You probably shouldn’t use this if you have really generic page/post titles, but it can be a really handy feature.
Basically, if a user searches for something that happens to be an exact match to a page or post you have, it’ll redirect the user to the page, rather than displaying search results.
add_action('template_redirect', 'seach_query_is_title');
function seach_query_is_title() {
if (is_search()) {
global $wp_query;
if ( get_page_by_title( get_search_query(), 'OBJECT', 'post' ) ) {
wp_redirect( get_permalink( get_page_by_title (get_search_query() )->ID ) );
}
elseif ( get_page_by_title( get_search_query(), 'OBJECT', 'page' ) ) {
wp_redirect( get_permalink( get_page_by_title( get_search_query() )->ID ) );
}
}
}