<?php
$content = "Server (1.7.2) playercount: 400/500";
preg_match('/^\w+\s\((\d\.\d\.\d)\)\s\w+:\s(\d+\/\d+)$/', $content, $result);
PD9waHAKCiRjb250ZW50ID0gICJTZXJ2ZXIgKDEuNy4yKSBwbGF5ZXJjb3VudDogNDAwLzUwMCI7CnByZWdfbWF0Y2goJy9eXHcrXHNcKChcZFwuXGRcLlxkKVwpXHNcdys6XHMoXGQrXC9cZCspJC8nLCAkY29udGVudCwgJHJlc3VsdCk7CnByaW50X3IoJHJlc3VsdCk7