Subtitile Edit [RemoveStartEndNoise]

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            var text = "<i>Ivandro Ismael</i>";
            var stopWatch = System.Diagnostics.Stopwatch.StartNew();
            var first_result = string.Empty;
            for (int i = 0; i < 10000000; i++)
            {
                first_result = RemoveStartEndNoise1(text);
                if (i == 0)
                    Console.Write("First result method 1: " + first_result);
            }
            stopWatch.Stop();
            Console.WriteLine(stopWatch.Elapsed);
            stopWatch.Restart();
            stopWatch.Start();
            for (int i = 0; i < 10000000; i++)
            {
                 first_result = RemoveStartEndNoise2(text);
                 if (i == 0)
                     Console.Write("First result method 2: " + first_result);
            }
            stopWatch.Stop();
            Console.WriteLine(stopWatch.Elapsed);

            //var result = RemoveStartEndNoise1(text);
            //Console.WriteLine(result);
            Console.ReadKey();
        }

        public static string RemoveStartEndNoise1(string text)
        {
            const int i = ('i' | 'I');
            const int b = ('b' | 'B');
            const int u = ('u' | 'U');

            string s = text.Trim();
            // <i> <I> | <b> <B> | <u> <U>
            if (text.Length > 3 && text[0] == '<' && text[2] == '>' &&
                ((text[1] & i) == text[1] || (text[1] & b) == text[1] || (text[1] & u) == text[1]))
            {
                s = s.Substring(3).TrimStart();
            }

            // </i> </I> | </b> </B> | </u> </U>
            int aIdx = s.Length - 4;
            int bIdx = aIdx + 2;

            if (s.Length > 4 && s[aIdx + 1] == '/' && s[aIdx] == '<' && s[aIdx + 3] == '>' &&
                 ((s[bIdx] & i) == s[bIdx] || (s[bIdx] & b) == s[bIdx] || (s[bIdx] & u) == s[bIdx]))
                s = s.Substring(0, s.Length - 4);

            if (s.Length > 1 && s[0] == '-')
                s = s.TrimStart('-');

            return s.Trim();
        }

        public static string RemoveStartEndNoise2(string text)
        {
            string s = text.Trim();
            if (s.StartsWith("<b>") && s.Length > 3)
                s = s.Substring(3);
            if (s.StartsWith("<i>") && s.Length > 3)
                s = s.Substring(3);
            if (s.StartsWith("<u>") && s.Length > 3)
                s = s.Substring(3);
            if (s.StartsWith("<B>") && s.Length > 3)
                s = s.Substring(3);
            if (s.StartsWith("<I>") && s.Length > 3)
                s = s.Substring(3);
            if (s.StartsWith("<U>") && s.Length > 3)
                s = s.Substring(3);

            if (s.EndsWith("</b>") && s.Length > 4)
                s = s.Substring(0, s.Length - 4);
            if (s.EndsWith("</i>") && s.Length > 4)
                s = s.Substring(0, s.Length - 4);
            if (s.EndsWith("</u>") && s.Length > 4)
                s = s.Substring(0, s.Length - 4);
            if (s.EndsWith("</B>") && s.Length > 4)
                s = s.Substring(0, s.Length - 4);
            if (s.EndsWith("</I>") && s.Length > 4)
                s = s.Substring(0, s.Length - 4);
            if (s.EndsWith("</U>") && s.Length > 4)
                s = s.Substring(0, s.Length - 4);

            if (s.StartsWith("-") && s.Length > 2)
                s = s.TrimStart('-');

            return s.Trim();
        }
    }
}
// Note: the first method is like 10 second faster than second one...