“Buy Now” Button to "Register"

* Change "Buy Now!" button text;
*
function tribe_buy_now_button_text( $html ) {
$html = str_replace( 'Buy Now!' , 'Register Now!', $html );
return $html;
}
add_filter( 'tribe_tickets_buy_button', 'tribe_buy_now_button_text', 11, 2 );