using System;

using System.Text.RegularExpressions;

public class Program

{

    const string pattern = @"(?<!<color=green>|[a-zA-Z0-9])(int|void|float|bool)(?!<\/color>|[a-zA-Z0-9])";

    const string replacement = "<color=green>$1</color>";

    const string input = @"

public int Example(float x, bool y, int z)

{

    someGenericMethod<int>();

    return y ? (int)x : z;

}

​

public <color=green>int</color> ExamepleAlreadyReplaced(<color=green>float</color> x, <color=green>bool</color> y, <color=green>int</color> z)

{

    someGenericMethod<<color=green>int</color>>();

    return y ? (<color=green>int</color>)x : z;

}

​

public void EdgeCaseKeyWordsInNames()

{

    var someint = int.MinValue;;

    var somefloat = float.MaxValue;

    var somebool = false;

    var somevoid = () => { };

    var int2 = 0;

    var intX = 0;

}

";

    public static void Main()

    {

        Console.WriteLine(Regex.Replace(input, pattern, replacement));

    }

}