The regex matches 9:02 pm, and since you haven't anchored it, the regex match comes out true even if it didn't match the whole string. Use at least a word boundary: 
/\b(1[012]|[1-9]):([0-5][0-9]).([aApP][mM])\b/

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See perlretut and perlre for more details.

Perl 6 - second systems done right

In reply to Re: regular expression for "time-of-day" is not working by moritz
in thread regular expression for "time-of-day" is not working by vjvalor

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