using System;
using System.Text.RegularExpressions;
 
public class RegexExample
{
    public static void Main()
    {
        var text = "ThisStringHasNoSpacesASCIIButItDoesHaveCapitalsLINQ";
 
        // Use positive lookbehind to locate all upper-case letters
        // that are preceded by a lower-case letter.
        var patternPart1 = "(?<=[a-z])([A-Z])";
 
        // Used positive lookbehind and lookahead to locate all
        // upper-case letters that are preceded by an upper-case
        // letter and followed by a lower-case letter.
        var patternPart2 = "(?<=[A-Z])([A-Z])(?=[a-z])";
 
        var pattern = patternPart1 + "|" + patternPart2;
        var rgx = new Regex(pattern);
        var result = rgx.Replace(text, " $1$2");
 
        Console.WriteLine("Input: [{0}]\nOutput: [{1}]", text, result);
    }
}
 

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