using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"((?:\/[A-Za-z0-9-]+)+)?(\/tag\/[A-Za-z0-9-%]+)+(\/.*)?";
string substitution = @"$2";
string input = @"http://example.com/cat1/subcat3/subcat4/tag/this%20is%20page/asdasda?start=130/asdasdasd
http://example.com/cat1/subcat3/subcat4/tag/this%20is%20pageasdasd
example.it/news/tag/this%is%20n%page?adsadsadasd
http://example.com/tag/thispage/asdasdasd.-?asds=
http://example.com/tag/this%20is%20page/asdasd
http://example.com/tag/this
";
Regex regex = new Regex(pattern);
string result = regex.Replace(input, substitution);
}
}
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