using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^(?:(?:(?:0?[1-9]|1\d|2[0-8])[/](?:0?[1-9]|1[0-2])|(?:29|30)[/](?:0?[13-9]|1[0-2])|31[/](?:0?[13578]|1[02]))[/](?:0{2,3}[1-9]|0{1,2}[1-9]\d|0?[1-9]\d{2}|[1-9]\d{3})|29[/]0?2[/](?:\d{1,2}(?:0[48]|[2468][048]|[13579][26])|(?:0?[48]|[13579][26]|[2468][048])00))$";
string input = @"31/5/2000
31/05/2000
32/5/2000
30/6/2000
31/6/2000
28/2/2014
29/2/2014
28/02/2016
29/02/2016";
RegexOptions options = RegexOptions.Multiline;
foreach (Match m in Regex.Matches(input, pattern, options))
{
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