using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^(([0-9]){1,3})[.](([0-9]){1,3})[.](([0-9]){1,3})[.](([0-9]){1,3})$";
string input = @"1
1.
1.1
1.1
1.1.
1.1.1
1.1.1.
1.1.1.1
1.1.1.1.
1.1.1.1.1
20
20.
20.20
20.20.
20.20.20
20.20.20.
20.20.20.20
20.20.20.20.
20.20.20.20.20
300
300.
300.300
300.300.
300.300.300
300.300.300.
300.300.300.300
300.300.300.300.
300.300.300.300.300
4000
4000.
4000.4000
4000.4000.
4000.4000.4000
4000.4000.4000.
4000.4000.4000.4000
4000.4000.4000.4000.
4000.4000.4000.4000.4000
ak</';
1,1,1,1";
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