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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 input = "CamelCase";
  9.     string output = Regex.Replace(input, 
  10.       @"(?:\b|(?<=([A-Za-z])))([A-Z][a-z]*)", 
  11.       m => string.Format(@"{0}{1}", 
  12.         (m.Groups[1].Value.Length > 0)? "_" : "", m.Groups[2].Value.ToUpper()));
  13.     Console.WriteLine(output);
  14.   }
  15. }
Success #stdin #stdout 0.07s 37280KB
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stdin
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Standard input is empty
stdout
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CAMEL_CASE
https://ideone.com/qu2bj
language:
C# (gmcs 5.20.1)
created:
13 years ago
visibility:
public

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