Extract Date and Time from a String Using Regex

Question

I am working on a regex that accepts all possible formats of date and time to extract them from a sentence.

This is my Regex:

@\"(?:(?:31(\\/|-|\\.)(?:0?         


        

Answer 1

Your regex part before the \D* + time pattern matches various types of dates, and must be grouped before adding any other pattern to follow. That is, (?<date>DATE1_PATTERN|DATE2_PATTERN|DATEn_PATTERN)\D*(?<time>TIME_PATTERN).

Then, just match and access named groups:

var s = "Meet me on 31/07/2019 at 3:00 PM to celebrate and then the meeting will be on 03/08/2019 at 12:00 PM.";
var pattern = @"(?<date>(?:(?:31([-/.])(?:0?[13578]|1[02]|(?:Jan|Mar|May|Jul|Aug|Oct|Dec)))\1|(?:(?:1|30)([-/.])(?:0?[13-9]|1[0-2]|(?:Jan|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec))\2))(?:(?:1[6-9]|[2-9]\d)?\d{2})|(?:29([-/.])(?:0?2|Feb)\3(?:(?:(?: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])([-/.])(?:(?:0?[1-9]|(?:Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep))|(?:1[0-2]|(?:Oct|Nov|Dec)))\4(?:(?:1[6-9]|[2-9]\d)?\d{2}))\D*(?<time>\d{1,2}:\d{2}\s[AP]M)";
var result = Regex.Matches(s, pattern);
foreach (Match m in result) {
    Console.WriteLine(m.Groups["date"].Value);
    Console.WriteLine(m.Groups["time"].Value);
}

See the C# demo, output:

31/07/2019
3:00 PM
03/08/2019
12:00 PM

Here is the .NET regex fiddle.