Simple Regex Question: Just fetch some numbers out of a string.

It is probably dead simple but I wasn't able to find the solution. I have to rewrite some topics in a database and for this I have to cut a number out of it. This is what I tried to get the "453:":

    preg_match('[0-9:]', "Status Update 453: News that might disturb", $matches);
    $result = $matches[1];
echo $result;

PHP:

I have a program called regexbuddy and it shows that the regex should work but it doesnt... any help would be fantastic!

 

<?php

preg_match('/([0-9:]{4})/', "Status Update 453: News that might disturb", $matches);
$result = $matches[0];
echo $result;

?>

PHP:

You have to add delimiters, to the start and end of the expression.

 

add delimiters, it's should work.

 

thanks a lot guys!