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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;

namespace Textile
{
	static class ExtensionMethods
	{
		public static string RegexReplace(this string text, string pattern, string replacement)
		{
			return Regex.Replace(text, pattern, replacement);
		}
	}

	class Program
	{
		private static string Convert(string text)
		{
			return text.
				//RegexReplace(@"\*((?:\w+\s*)+)\*", "<strong>$1</strong>").
				//RegexReplace(@"_((?:\w+\s*)+)_", "<em>$1</em>").
				//RegexReplace(@"\?\?((?:\w+\s*)+)\?\?", "<cite>$1</cite>");
				RegexReplace(@"\bfoo\b", "bar").
				RegexReplace(@"\b\*((?:\w+\s*)+)\*\b", "<strong>$1</strong>").
				RegexReplace(@"_((?:\w+\s*)+)_", "<em>$1</em>").
				RegexReplace(@"\?\?((?:\w+\s*)+)\?\?", "<cite>$1</cite>");
		}

		static void Main(string[] args)
		{
			var tests = new[] { " foo foo ", "*bold*", "*bold* *bold*", "_italic_ _italic_", "??foo bar baz?? ??qux quux??", "??*Cool*, eh???", "_asd asd asd_ads_" };
			foreach (var test in tests)
				Console.WriteLine("{0} -> {1}", test, Convert(test));
		}
	}
}