Verifying Entry of Valid Time

[Kevin Reynolds]

I am just writing a basic form where the user enters the time of an event.  
It is entered in 24 hour format (HHMM) with no seconds.  What I want to do 
is perform some error checking on the entry by confirming that the first two 
numbers are between 00 and 23 and the second two are between 00 and 59.

Normally I would separate them into two varialbes, $hour and $minute and 
then perform the error checking with a couple of if statements.  But since 
there is no delimiter, how do you separate the two?  I know it can be done, 
I just forget how (or never really understood how).

Thank you,
Kevin
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