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Editorial Team
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Asked: 2026-06-11T17:46:13+00:00

found this datetime regular expression in RegExLib site -> http://regexlib.com/REDetails.aspx?regexp_id=361 string pattern = @(((((0[13578])|([13578])|(1[02]))[\-\/\s]?((0[1-9])|([1-9])|([1-2][0-9])|(3[01])))|((([469])|(11))[\-\/\s]?((0[1-9])|([1-9])|([1-2][0-9])|(30)))|((02|2)[\-\/\s]?((0[1-9])|([1-9])|([1-2][0-9]))))[\-\/\s]?\d{4})(\s(((0[1-9])|([1-9])|(1[0-2]))\:([0-5][0-9])((\s)|(\:([0-5][0-9])\s))([AM|PM|am|pm]{2,2})))?;

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found this datetime regular expression in RegExLib site -> http://regexlib.com/REDetails.aspx?regexp_id=361

    string pattern = @"(((((0[13578])|([13578])|(1[02]))[\-\/\s]?((0[1-9])|([1-9])|([1-2][0-9])|(3[01])))|((([469])|(11))[\-\/\s]?((0[1-9])|([1-9])|([1-2][0-9])|(30)))|((02|2)[\-\/\s]?((0[1-9])|([1-9])|([1-2][0-9]))))[\-\/\s]?\d{4})(\s(((0[1-9])|([1-9])|(1[0-2]))\:([0-5][0-9])((\s)|(\:([0-5][0-9])\s))([AM|PM|am|pm]{2,2})))?";
    var match = Regex.Match("test 123 11/30/2003 10:12:24 am", pattern, RegexOptions.IgnoreCase);

the datetime format i’m looking for is m/d/yyyy hh:mm:ss

the above looks for m/d/yyyy hh:mm am|pm

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1 Answer

  1. Editorial Team

    Two minutes of work using RegexBuddy gave me a solution of:

    string pattern = @"(((((0[13578])|([13578])|(1[02]))[\-\/\s]?((0[1-9])|([1-9])|([1-2][0-9])|(3[01])))|((([469])|(11))[\-\/\s]?((0[1-9])|([1-9])|([1-2][0-9])|(30)))|((02|2)[\-\/\s]?((0[1-9])|([1-9])|([1-2][0-9]))))[\-\/\s]?\d{4})(\s(((0[1-9])|([1-9])|([0-2][0-3]))\:([0-5][0-9])((\s)|(\:([0-5][0-9])))))";

    This matches 11/30/2003 10:12:24 in your test expression. It also matches 11/30/2003 23:12:24 and 11/30/2003 00:00:01

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