using System;

using System.Text.RegularExpressions;

public class Program

{

    public static void Main()

    {

    string pattern = @"^\p{L}*[\.|-|\/|\\|\s|\,]*(?<day>0[1-9]|[12][0-9]|3[01])+(st|nd|rd|th)?(\.|-|\/|\\|\s|\,)+(?<month>January|February|March|April|May|June|July|August|September|October|November|December|Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)(\.|-|\/|\\|\s|\,)+(?<year>\d{4}|\d{2})\b";

        string input = @"Wednesday, 19-Apr-23 16:25:39 UTC-test4

Wednesday, 19-Apr-23 16:25:39 UTC-test4

Wed, 19 Apr 2023 16:25:39 +0000-test3       

Wed, 19 Apr 23 16:25:39 +0000-test7         

Wed, 19 Apr 2023 16:25:39 +0000-test11      

Wednesday, 19-Apr-2023 16:25:39 UTC-test10  

Wed, 19 Apr 23 16:25:39 +0000-test5

Wed, 19 Apr 2023 16:25:39 +0000-test6   

Apr-19-2024

31th December 2024 Dinner reservation

12-30-24 Team lunch

30-12-24 Team Lunch

09/2024/30 Prepare budget

2024-11-18 Meeting with client

11/18/2024 Submit project report

18-11-2024 Team building event

Nov 18, 2024 Annual review

2024.11.18 Update software

Monday, November 18, 2024 Plan presentation

2024/11/18 Organize files

2024/11/18-Organize files

24.11.18.Organize files

11-18-2024 Buy groceries

2024 November 18 Finish book

2024 28 November Finish book

2024-28-November Finish book

18/11/2024 Start new project

2024-18-11 Clean office

2024-18-11-23Clean office

November 18, 2024 Family gathering

November 18, 24 Family gathering

2024/18/11 Call supplier

24/18/11 Call supplier

11.18.2024 Schedule meeting

2024/11.18 Write article

18.11.2024 Check emails

2024-11.18 Attend webinar

2024 November 18

2023-04-19T16:25:39Z-test1  

2023-04-19T16:25:39+0000-test2  

Wed, 19 Apr 2023 16:25:39 +0000-test3

Wednesday, 19-Apr-23 16:25:39 UTC-test4

Wed, 19 Apr 23 16:25:39 +0000-test5

Wed, 19 Apr 2023 16:25:39 +0000-test6

Wed, 19 Apr 23 16:25:39 +0000-test7

2023-04-19T16:25:39+00:00-test8

2023-04-19T16:25:39+00:00-test9

Wednesday, 19-Apr-2023 16:25:39 UTC-test10

Wed, 19 Apr 2023 16:25:39 +0000-test11

2023-04-19T16:25:39+00:00-test12

2023-04-19 16:25:39.658210121 +0000-test13

2023-19-04 16:25:39-test14

2023-19-04 04:25:39 PM-test15

19-04-2023 16:25:39-test16

04-19-2023 16:25:39-test17

";

        RegexOptions options = RegexOptions.Multiline;

        foreach (Match m in Regex.Matches(input, pattern, options))

        {

            Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);

        }

    }

}