To be on the safe side it's probably best to allow whitespaces (or none) in some more places which would turn the regex into:
$time =~ /^\s*(\d{1,2})\s*:\s*(\d\d)\s*([APM]{2})\s*$/The \s* matches zero or more whitespaces and as many as possible (greedy). So this allows for any of the following (_ equals whitespace):
_12:00_AM__
1_:_00_PM
2:20AM
And then you could allow for leaving out of AM/PM and assuming a 24 hour clock .... but /me gets carried away ;)
-- Hofmator
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