RackPeek/Shared.Rcl/AnsiToHtml.cs

using System.Text.RegularExpressions;

public static class AnsiStripper
{
    private static readonly Regex CsiRegex =
        new(@"\x1B\[[0-9;?]*[A-Za-z]", RegexOptions.Compiled);

    public static string Strip(string input)
    {
        if (string.IsNullOrEmpty(input))
            return "";

        return CsiRegex.Replace(input, "");
    }
}