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}(\-[a-zA-Z]{1,50})?)";
string input = @"Should match
0.0.0
0.0.0-a
1.5.89-lorem
6.12.5-iPsUm
Mustn't match (even partially)
a.2.3 -> 'a' is not a number
1.5.89:lorem -> only '-' is valid to separate version and letters
1.2.3-4 -> '4' is not letter(s)
5.6.8.9 -> '9' is not letters and '.' used instead of '-'
8.k.2-j -> 'k' is not a number
7895.5.8 -> '7895' is 4 digit long, 3 is the max
";
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