<?php
$message = "24. What would you prefer, to go to a restaurant or to a night club? ";
preg_match('/^\d+\.(.*)$/', $message, $matches);
var_dump($matches);
array(2) {
[0]=>
string(69) "24. What would you prefer, to go to a restaurant or to a night club? "
[1]=>
string(66) " What would you prefer, to go to a restaurant or to a night club? "
}