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  1. using System;
  2. using System.Text.RegularExpressions;
  3.  
  4. public class Example
  5. {
  6.    public static void Main()
  7.    {
  8.       string phone = "11122233334";
  9.  
  10.       string txt = Regex.Replace(
  11.       	             Regex.Replace(phone, @"(^\d{10})(\d)", "$1 ext $2"),
  12.       	           @"(\d{3})(\d{3})(\d{4})", "($1) $2-$3");
  13.  
  14.       Console.WriteLine(txt);
  15.    }
  16. }
Success #stdin #stdout 0.1s 24272KB
comments (?)
stdin 
Standard input is empty
stdout 
(111) 222-3333 ext 4
https://ideone.com/hYiT61
language:
C# (gmcs 5.20.1)
created:
9 years ago
visibility:
public

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