using System;
using System.Text.RegularExpressions;
public class Example
{
public static void Main()
{
string pattern = @"{IF\s*([^}]+)}([\s\S]+)(?:{\/?ELSE})([\s\S]+?){\/IF}";
string input = @"{IF !isLoggedIn}
<a href=""/sign-in/"">Sign In</a>
{ELSE}
Welcome back, {>username}!<br />
{# students}
<li>{#>last_name}, {#>first_name}</li>
{/#}
{/IF}
{IF isLoggedIn}
Beta Testing...
{/IF}";
RegexOptions options = RegexOptions.IgnoreCase | RegexOptions.Multiline;
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