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i found this here : 
 
<a href="http://onetidbit.wordpress.com/2008/05/21/regular-expression-validator-for-date-format-dd-mmm-yy-and-dd-mmm-yyyy/" rel="ugc">http://onetidbit.wordpress.com/2008/05/21/regular-expression-validator-for-date-format-dd-mmm-yy-and-dd-mmm-yyyy/</a> 

<pre><code class="code-1 nolinks" id="code-205844">ValidationExpression=&quot;^(d{0}|(31(?!(Feb|feb|Apr|apr|Jun|jun|Sep|
sep|Nov|nov)))|((30|29)(?!Feb|feb))|(29(?=Feb|feb(((1[6-9]|[2-9]\
d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00
)))))|(29(?=Feb|feb(((0[48]|[2468][048]|[13579]
[26])|((16|[2468][048]|[3579][26])00)))))|(0?[1-9])|1\d|2[0-8])[- ](Jan|jan|feb|Feb|mar|Mar|may|May|apr|Apr|jul|Jul|Jun|jun|Aug|aug|
Oct|oct|Sep|sep|Nov|nov|dec|Dec)[- ]((1[6-9]|[2-9]\d)\d{2}|\d{2}|d{0})$&quot;
</code></pre>
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To write an expression that verifies that the date is actually valid, would be very complicated. You can verify that it at least looks like a date: 
 
&quot;^([0-2]\d|3[0-1])-(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)-\d{4}$&quot; 
 
With a more complicated expression you can also match the month names against different valid dates, so that dates like 31-Nov is not allowed. It depends on how much you want to verify.
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For dd MMM yyyy Date : 
^((31(?!\ (Feb(ruary)?|Apr(il)?|June?|(Sep(?=\b|t)t?|Nov)(ember)?)))|((30|29)(?!\ Feb(ruary)?))|(29(?=\ Feb(ruary)?\ (((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00)))))|(0?[1-9])|1\d|2[0-8])\ (Jan(uary)?|Feb(ruary)?|Ma(r(ch)?|y)|Apr(il)?|Ju((ly?)|(ne?))|Aug(ust)?|Oct(ober)?|(Sep(?=\b|t)t?|Nov|Dec)(ember)?)\ ((1[6-9]|[2-9]\d)\d{2})$ 
 
For dd MMM yyyy Date (With Leap year)----&gt; (^(3[01]|[12][0-9]|0?[1-9])\s{1}(Jan|Mar|May|Jul|Aug|Oct|Dec)\s{1}((1[8-9]\d{2})|([2-9]\d{3}))$)|(^(30|[12][0-9]|0?[1-9])\s{1}(Apr|Jun|Sep|Nov)\s{1}((1[8-9]\d{2})|([2-9]\d{3}))$)|(^(2[0-8]|1[0-9]|0?[1-9])\s{1}(Feb)\s{1}((1[8-9]\d{2})|([2-9]\d{3}))$)|(^(29)\s{1}(Feb)\s{1}([2468][048]00)$)|(^(29)\s{1}(Feb)\s{1}([3579][26]00)$)|(^(29)\s{1}(Feb)\s{1}([1][89][0][48])$)|(^(29)\s{1}(Feb)\s{1}([2-9][0-9][0][48])$)|(^(29)\s{1}(Feb)\s{1}([1][89][2468][048])$)|(^(29)\s{1}(Feb)\s{1}([2-9][0-9][2468][048])$)|(^(29)\s{1}(Feb)\s{1}([1][89][13579][26])$)|(^(29)\s{1}(Feb)\s{1}([/])([2-9][0-9][13579][26])$) 
 
 
 
^((31(?!\ (Feb(ruary)?|Apr(il)?|June?|(Sep(?=\b|t)t?|Nov)(ember)?)))|((30|29)(?!\ Feb(ruary)?))|(29(?=\ Feb(ruary)?\ (((1[6-9]|[2-9]\d)(0[48]|[2468][048]|[13579][26])|((16|[2468][048]|[3579][26])00)))))|(0?[1-9])|1\d|2[0-8])\ (Jan(uary)?|Feb(ruary)?|Ma(r(ch)?|y)|Apr(il)?|Ju((ly?)|(ne?))|Aug(ust)?|Oct(ober)?|(Sep(?=\b|t)t?|Nov|Dec)(ember)?)\ ((1[6-9]|[2-9]\d)\d{2})$ 
 
For more information, Please visit: &nbsp;<a href="http://regexlib.com" rel="ugc">http://regexlib.com</a> 
<a href="http://www.geekzilla.co.uk/View653502BD-00B7-4012-9786-F941208F5F0C.htm" rel="ugc">http://www.geekzilla.co.uk/View653502BD-00B7-4012-9786-F941208F5F0C.htm</a> 
 
Regards, 
M.Raja 
 

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<div class="content wysiwyg-content">
Would anyone have an expression that allows for dd-MMM-yyyy 
 
i.e- 13-Nov-2008
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Would anyone have an expression that allows for dd-MMM-yyyy

i.e- 13-Nov-2008

ValidationExpression for dd-MMM-yyyy

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