It's got other problems too. It won't match "09:02" or "23:02" or "00:02". You probably want something like this ... 
  /\b
    (
      (
        ([01][0-9]|2[0123]):[0-5][0-9]
      )
     |(
        (1[012]|[1-9]     ):[0-5][0-9]\s+[ap]m
      )
    )
  \b/ix

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

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