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Regular Expression Details

Title Test Find Validate dates from 1/1/0001 to 12/31/9999
Expression
^(?=0?[1-9]/|1[012]/)(?:(?<month>(?<month31days>0?[13578]|1[02])|(?<month30days>0?[469]|11)|(?<monthFeb>0?2))/)(?<day>(?(month31days)(?:[012]?[1-9]|3[01]))(?(month30days)(?:[012]?[1-9]|30))(?(monthFeb)(?:[01]?[1-9]|2(?(?=\d/(?:(?:(?:04|08|12|16|20|24|28|32|36|40|44|48|52|56|60|64|68|72|76|80|84|88|92|96)00)|(?:\d\d(?:04|08|12|16|20|24|28|32|36|40|44|48|52|56|60|64|68|72|76|80|84|88|92|96))))[0-9]|[0-8]))))/(?<year>(?!0000)\d{4})$
Description
Validates dates from 1/1/0001 to 12/31/9999. Month and day can be preceded by a zero to a max of two digits; however, year must be four digits exactly. This regex was developed in a .NET environment and uses conditional lookahead syntax, so your regex engine must support same. Month, day, and year are captured to groups named "month", "day", and "year" for additional processing if desired.
Matches
2/29/2000 | 01/01/0001 | 9/18/2009
Non-Matches
2/29/2100 | 4/31/2009 | 001/31/2009
Author Rating: Not yet rated. Jerry Schmersahl
Source
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