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    <p>Here's one way to make a regular expression that will match any date of your desired format (though you could obviously tweak whether commas are optional, add month abbreviations, and so on):</p> <pre><code>years = r'((?:19|20)\d\d)' pattern = r'(%%s) +(%%s), *%s' % years thirties = pattern % ( "September|April|June|November", r'0?[1-9]|[12]\d|30') thirtyones = pattern % ( "January|March|May|July|August|October|December", r'0?[1-9]|[12]\d|3[01]') fours = '(?:%s)' % '|'.join('%02d' % x for x in range(4, 100, 4)) feb = r'(February) +(?:%s|%s)' % ( r'(?:(0?[1-9]|1\d|2[0-8])), *%s' % years, # 1-28 any year r'(?:(29), *((?:(?:19|20)%s)|2000))' % fours) # 29 leap years only result = '|'.join('(?:%s)' % x for x in (thirties, thirtyones, feb)) r = re.compile(result) print result </code></pre> <p>Then we have:</p> <pre><code>&gt;&gt;&gt; r.match('January 30, 2001') is not None True &gt;&gt;&gt; r.match('January 31, 2001') is not None True &gt;&gt;&gt; r.match('January 32, 2001') is not None False &gt;&gt;&gt; r.match('February 32, 2001') is not None False &gt;&gt;&gt; r.match('February 29, 2001') is not None False &gt;&gt;&gt; r.match('February 28, 2001') is not None True &gt;&gt;&gt; r.match('February 29, 2000') is not None True &gt;&gt;&gt; r.match('April 30, 1908') is not None True &gt;&gt;&gt; r.match('April 31, 1908') is not None False </code></pre> <p>And what is this glorious regexp, you may ask?</p> <pre><code>&gt;&gt;&gt; print result (?:(September|April|June|November) +(0?[1-9]|[12]\d|30), *((?:19|20)\d\d))|(?:(January|March|May|July|August|October|December) +(0?[1-9]|[12]\d|3[01]), *((?:19|20)\d\d))|(?:February +(?:(?:(0?[1-9]|1\d|2[0-8]), *((?:19|20)\d\d))|(?:(29), *((?:(?:19|20)(?:04|08|12|16|20|24|28|32|36|40|44|48|52|56|60|64|68|72|76|80|84|88|92|96))|2000)))) </code></pre> <p>(I initially intended to do a tongue-in-cheek enumeration of the possible dates, but I basically ended up hand-writing that whole gross thing except for the multiples of four, anyway.)</p>
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    1. POMatching dates with regular expressions in Python?
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    1. POMatching dates with regular expressions in Python?
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    1. COThanks for that! I'm still going through the regexp you gave me slowly to dissect and understand the individual components but I see how the best way to go about doing it would have been to group together months with basically no differences other than name and separate February out from the rest and match that in another part of the expression
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    2. COI said there was "no easy way" to make a regular expression check the month against the date. So you showed how to do it... the hard way... you, sir, are insane, but it's the good kind of insanity. +1! P.S. I especially like the leap year checker.
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