using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(0[1-9]|1[0-9]|2[0-9]|3[01]).(0[1-9]|1[012]).([0-9]{4})( ([0-1]\d|2[0-3])(:[0-5]\d){2}|)";
string input = @"21.10.2013 13:27:35";
Match m = Regex.Match(input, pattern);
Console.WriteLine("'{0}' found at index {1}", m.Value, m.Index);
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx