Count regex replaces (C#)

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Thanks to both Chevex and Guffa. I started looking for a better way to get the results and found that there is a Result method on the Match class that does the substitution. That’s the missing piece of the jigsaw. Example code below:

using System.Text.RegularExpressions;

namespace regexrep
{
    class Program
    {
        static int Main(string[] args)
        {
            string fileText = System.IO.File.ReadAllText(args[0]);
            int matchCount = 0;
            string newText = Regex.Replace(fileText, args[1],
                (match) =>
                {
                    matchCount++;
                    return match.Result(args[2]);
                });
            System.IO.File.WriteAllText(args[0], newText);
            return matchCount;
        }
    }
}

With a file test.txt containing aaa, the command line regexrep test.txt "(?<test>aa?)" ${test}b will set %errorlevel% to 2 and change the text to aabab.

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