using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"^([ ])?\[(\/?)gaiarch(=[^""]*)?]([ ])?|([ ])?\[(\/?)gaiarch(=[^""]*)?]([ ])?$";
string input = @"[gaiarch=slider]
[img url=""http://i1251.photobucket.com/albums/hh543/Knight-Yoshi/trade_c.png"" text=""Trading Image"" goto=""http://www.gaiaonline.com/gaia/bank.php?mode=trade&uid=15388423""],[img url=""http://i1251.photobucket.com/albums/hh543/Knight-Yoshi/friend_c.png"" text=""Friends Image"" goto=""http://www.gaiaonline.com/friends/add/15388423""][/gaiarch]
[gaiarch=slider][img url=""http://i1251.photobucket.com/albums/hh543/Knight-Yoshi/gaiaonline/thread/post/dark-center_bottom_zps419960f4.gif"" text=""bottom bar""]
[img url=""http://i1251.photobucket.com/albums/hh543/Knight-Yoshi/gaiaonline/thread/post/star-say_right_zpsdc3769f3.png"" goto=""http://www.gaiaonline.com/""][/gaiarch] ";
RegexOptions options = RegexOptions.IgnoreCase;
foreach (Match m in Regex.Matches(input, pattern, options))
{
Console.WriteLine("'{0}' found at index {1}.", m.Value, m.Index);
}
}
}
Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for C#, please visit: https://msdn.microsoft.com/en-us/library/system.text.regularexpressions.regex(v=vs.110).aspx