Use the plus sign “+” instead of dash “-” in URLs

Question

Is it possible to use the plus sign instead of the dash as the word delimiter in the url? And if so, how exactly would that be done?

e.g.: www.example.com/some-title/ becomes www.example.com/some+title/

Of course, ideally it would have to work with posts, pages and custom posts.

Answer 1

Mark Jaquith uses "+" as the search query string delimiter in his Nice Search Plugin. Here's what he does:

function cws_nice_search_redirect() {
    if ( is_search() && strpos( $_SERVER['REQUEST_URI'], '/wp-admin/' ) === false && strpos( $_SERVER['REQUEST_URI'], '/search/' ) === false ) {
        wp_redirect( home_url( '/search/' . str_replace( array( ' ', '%20' ),  array( '+', '+' ), get_query_var( 's' ) ) ) );
        exit();
    }
}

Perhaps it may be of some use for reference?