using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"(?=(?:(?:[^""][do_collapse""){2})*[^""]*$)))";
string input = @"[do_collapse id='dsds'] fewfw fewfw [/do_collapse] @user1 @user2 ignoreme
[header]frfw[/header]
:\)(?=(?:(?:[^""][do_collapse""){2})*[^""]*$)";
Match m = Regex.Match(input, pattern);
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