forms - PHP - preg_match to validate date format mm/yyyy -

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for check of birthday date (format: dd/mm/yyyy) in form i've used code , works fine.

if (!preg_match("/([012]?[1-9]|[12]0|3[01])\/(0?[1-9]|1[012])\/([0-9]{4})/",$date)){       $error[1]= "insert valid date"; }

but when want check date format mm/yyyy , use code, doesn't work anymore. when try example put 33/2014 in input php validation doesn't show error. 

if (!preg_match("/(0?[1-9]|1[012])\/([0-9]{4})/",$date2)){     $error[2]= "insert valid date"; }

where go wrong? thank help.

based on tim's checkdate based solution:

the extraction of day, month , year can done using explode as:

list($dd,$mm,$yyyy) = explode('/',$cnt_birthday); if (!checkdate($mm,$dd,$yyyy)) {         $error = true; }

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