using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(https?:\/\/)?(www\.)?(t\.me|telegram\.dog|telegram\.me)\/[A-Za-z0-9](?:[A-Za-z0-9_]{2,30}[A-Za-z0-9])?\/?";
string input = @"t.me/myAlfredo
t.me/_myAlfredo
https://telegram.dog/myAlfredo_
http://telegram.me/my_Alfredo/
https://www.t.me/myAlfredofghgffgfhffbgfbcvbcvbcvfgfg";
RegexOptions options = RegexOptions.IgnoreCase;
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