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  1. using System;
  2. using System.Text.RegularExpressions;
  3.  
  4. class Program
  5. {
  6.   static void Main()
  7.   {
  8.     string input = ". . . . First . . Second . . . . . Third . . .";
  9.     string output = Regex.Replace(input, @"((\s)?(\S)(?(2)|\s))\1+\s?", "$3");
  10.     Console.WriteLine(output);
  11.   }
  12. }
Success #stdin #stdout 0.07s 38336KB
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stdin
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Standard input is empty
stdout
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.First.Second.Third.
https://ideone.com/hDFtKw
language:
C# (gmcs 5.20.1)
created:
12 years ago
visibility:
public

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