using System;
using System.Text.RegularExpressions;
public class Test
{
public static void Main()
{
string post = "<font color=\"#000fff\" size=\"1\" face=\"Arial\">Genuine Windows® 7 Home Premium (64-bit)</font>";
post = Regex.Replace(post, "<font color=\"([a-fA-F0-9\\#]+)\"[^>]*>(.*?)</font>",
m => "[color=\"" + m.Groups[1].Value + "\"]" + m.Groups[2].Value + "[/color]");
Console.WriteLine(post);
}
}
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