using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^([\d]{4})[\-]([\d]{4})[\-]([\d]{4})[\-]([\d]{4})$";
string input = @"1234-5678-9012-3412
5645-6789-7897-9879
87979879879798798
13156465487987
54654 231321 45654 464 3213 5464 ";
RegexOptions options = RegexOptions.Multiline;
Match m = Regex.Match(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