using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^(?:
(?:0[1-9]|1\d|2[0-8])([\/-])(?:02)\1(?:\d+)|
(?:0[1-9]|1\d|2\d)([\/-])(?:02)\2(?:(?:\d*?(?:(?:0[48]|[13579][26]|[2468][048])|(?:(?:[02468][048]|[13579][26])00))|[48]00|[48])(?=\D|\b))|
(?:0[1-9]|1\d|2\d|30)([\/-])(?:0[469]|11)\3(?:\d+)|
(?:0[1-9]|1\d|2\d|3[01])([\/-])(?:0[13578]|1[02])\4(?:\d+)|
(?:02)([\/-])(?:0[1-9]|1\d|2[0-8])\5(?:\d+)|
(?:02)([\/-])(?:0[1-9]|1\d|2\d)\6(?:(?:\d*?(?:(?:0[48]|[13579][26]|[2468][048])|(?:(?:[02468][048]|[13579][26])00))|[48]00|[48])(?=\D|\b))|
(?:0[469]|11)([\/-])(?:0[1-9]|1\d|2\d|30)\7(?:\d+)|
(?:0[13578]|1[02])([\/-])(?:0[1-9]|1\d|2\d|3[01])\8(?:\d+)|
(?:\d+)([\/-])(?:0[1-9]|1\d|2[0-8])\9(?:02)|
(?:(?:\d*?(?:(?:0[48]|[13579][26]|[2468][048])|(?:(?:[02468][048]|[13579][26])00))|[48]00|[48])(?=\D|\b))([\/-])(?:0[1-9]|1\d|2\d)\10(?:02)|
(?:\d+)([\/-])(?:0[1-9]|1\d|2\d|30)\11(?:0[469]|11)|
(?:\d+)([\/-])(?:0[1-9]|1\d|2\d|3[01])\12(?:0[13578]|1[02])|
(?:\d+)([\/-])(?:02)\13(?:0[1-9]|1\d|2[0-8])|
(?:(?:\d*?(?:(?:0[48]|[13579][26]|[2468][048])|(?:(?:[02468][048]|[13579][26])00))|[48]00|[48])(?=\D|\b))([\/-])(?:02)\14(?:0[1-9]|1\d|2\d)|
(?:\d+)([\/-])\15(?:0[469]|11)(?:0[1-9]|1\d|2\d|30)|
(?:\d+)([\/-])(?:0[13578]|1[02])\16(?:0[1-9]|1\d|2\d|3[01])
)$";
string input = @"30/11/2017
30-11-2017
2017-05-31
30-/11-/2017
30-11/2017";
RegexOptions options = RegexOptions.Multiline | RegexOptions.IgnorePatternWhitespace;
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