Highlight value in string using Regex (C#)

I wrote little class that highlight values in string wrapping them in <span> tag with specific class. Notice that regex will not touch text inside html tags. So text "<div someValue>someValue</div>" will become "<div someValue><span class=''highlight'>someValue</span></div>".

	using System.Text.RegularExpressions;
	public static class Highlighter
	{
	private const string MatchPattern = "(?<!<[^>]*)(?<matched>{0})";
	private const string ReplacePattern = "<span class='highlight'>${matched}</span>";
	public static string Highlight(string value, string pattern)
	{
	var patternEsc = string.Format(MatchPattern, Regex.Escape(pattern));
	return Regex.Replace(value, patternEsc, ReplacePattern, RegexOptions.IgnoreCase);
	}
	}

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