Automatically rename a file if it already exists in Windows way

Question

My C# code is generating several text files based on input and saving those in a folder. Also, I am assuming that the name of the text file will be same as input.(The input

Answer 1

With this code if file name is "Test (3).txt" then it will become "Test (4).txt".

public static string GetUniqueFilePath(string filePath)
{
    if (File.Exists(filePath))
    {
        string folderPath = Path.GetDirectoryName(filePath);
        string fileName = Path.GetFileNameWithoutExtension(filePath);
        string fileExtension = Path.GetExtension(filePath);
        int number = 1;

        Match regex = Regex.Match(fileName, @"^(.+) \((\d+)\)$");

        if (regex.Success)
        {
            fileName = regex.Groups[1].Value;
            number = int.Parse(regex.Groups[2].Value);
        }

        do
        {
            number++;
            string newFileName = $"{fileName} ({number}){fileExtension}";
            filePath = Path.Combine(folderPath, newFileName);
        }
        while (File.Exists(filePath));
    }

    return filePath;
}