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    <p>A regular expression alone cannot validate a date because of the different number of days in months - especially for leap years.</p> <pre><code>/^(\d{1,2})(\/|-)(\d{1,2})\2(\d{2}|\d{4})$/ </code></pre> <p>but above regex solves your problem of allowing - or / based on these format dd-mm-yyyy or dd/mm/yyyy</p> <p>Here are some examples</p> <pre><code>//Date d/m/yy and dd/mm/yyyy //1/1/00 through 31/12/99 and 01/01/1900 through 31/12/2099 //Matches invalid dates such as February 31st '\b(0?[1-9]|[12][0-9]|3[01])[- /.](0?[1-9]|1[012])[- /.](19|20)?[0-9]{2}\b' //Date dd/mm/yyyy //01/01/1900 through 31/12/2099 //Matches invalid dates such as February 31st '(0[1-9]|[12][0-9]|3[01])[- /.](0[1-9]|1[012])[- /.](19|20)[0-9]{2}' //Date m/d/y and mm/dd/yyyy //1/1/99 through 12/31/99 and 01/01/1900 through 12/31/2099 //Matches invalid dates such as February 31st //Accepts dashes, spaces, forward slashes and dots as date separators '\b(0?[1-9]|1[012])[- /.](0?[1-9]|[12][0-9]|3[01])[- /.](19|20)?[0-9]{2}\b' //Date mm/dd/yyyy //01/01/1900 through 12/31/2099 //Matches invalid dates such as February 31st '(0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])[- /.](19|20)[0-9]{2}' //Date yy-m-d or yyyy-mm-dd //00-1-1 through 99-12-31 and 1900-01-01 through 2099-12-31 //Matches invalid dates such as February 31st '\b(19|20)?[0-9]{2}[- /.](0?[1-9]|1[012])[- /.](0?[1-9]|[12][0-9]|3[01])\b' //Date yyyy-mm-dd //1900-01-01 through 2099-12-31 //Matches invalid dates such as February 31st '(19|20)[0-9]{2}[- /.](0[1-9]|1[012])[- /.](0[1-9]|[12][0-9]|3[01])' </code></pre> <ul> <li><a href="http://www.roscripts.com/PHP_regular_expressions_examples-136.html" rel="nofollow">http://www.roscripts.com/PHP_regular_expressions_examples-136.html</a></li> </ul>
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    1. PODate validation dd-mm-yyyy or dd/mm/yyyy
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    1. PTAnswer
    1. USPramendra Gupta
    1. USPramendra Gupta
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      1. VTDownMod
    1. COThis would also allow `5/2/02`, i.e. it does not meet the requirements. At least you should mention it.
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      1. USFelix Kling
    2. COThis doesn't check if the date is *valid*.
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      1. USDan Beam
 

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