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From: Stephan Elinghaus <221015.6.seli@spamgourmet.com>
Newsgroups: comp.lang.php
Subject: Re: Check for military time
Date: Thu, 22 Oct 2015 13:16:33 +0200
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Am 2015-10-20 hat Derek Turner geschrieben:
> Is there a quick and dirty way to check that
>
> substr($string, 0 ,3) is a valid military time, ie. 0000-2359?

Maybe this works for you: 
<?php
$string="1534";
if(preg_match("/[012](((?<=2)[0123])|(?<!2)[0-9])[[0-5][0-9]/",$string))
echo "is valid";
else echo "is not valid";
?>

-- 
[no signature today]