Time Validator

[rafiqasad]

I need a regular expression that validate time hh:mm:ss. Please guide me

[Weirfire]

Can you share some code so we know what sort of thing will need validating?

[SmallPotatoes]

You can't easily validate it with a regular expression alone. Maybe it's possible, but not worth the effort I'd say.

Instead, try something like this (untested):
if (preg_match('/^(\d{1,2}):(\d{1,2}):(\d{1,2})$/',
trim($_REQUEST['time']), $matches)
&& $matches[1] < 24
&& $matches[2] < 60
&& $matches[3] < 60)
{
$valid_time = sprintf('%02d:%02d:%02d',
$matches[1], $matches[2], $matches[3]);
echo "<p>Valid time submitted: {$valid_time}</p>";
}
else
echo "<p>Time was invalid.</p>";