Given a gist embed script tag, get the gist's content

GistsResolver.cs

public class GistsResolver {
	public static string CreateContentForFeedFrom(string content) {
		try {
			return UnwrapGists(content, GetGist);
		}
		catch {
			return content;
		}
	}

	static readonly Regex GistsFinder = new Regex("<script src=\"https://gist.github.com/(?<gistid>\\d+).js(\\?file=(?<file>[^\"]+))?\">\\s*</script>", RegexOptions.Compiled);
	static JObject GetGist(string gistId) {
		try {
			var content =
				new WebClient().DownloadString("https://api.github.com/gists/" + gistId);
			var gist = JObject.Parse(content);
			return gist;
		}
		catch (Exception) {
			return null;
		}
	}

	private static string ContentToHtml(JObject file) {
		var content = file["content"].Value<string>();
		content = content.Replace("\r\n", "\n").Replace("\r", "\n").Replace("\n", "\r\n");
		content = Microsoft.Security.Application.Encoder.HtmlEncode(content, true);
		content = content.Replace("&#10;", "\n").Replace("&#13;", "\r");
		content = "<pre>" + content + "</pre>";
		var name = file["filename"].Value<string>();
		if (!string.IsNullOrEmpty(name)) {
			content = Microsoft.Security.Application.Encoder.HtmlEncode(name, true)
						+ ":<br/>"
						+ content;
		}
		return content;
	}

	private static string UnwrapGists(string c, Func<string, JObject> gistGetter) {
		return GistsFinder.Replace(c, match => {
			try {
				var gistId = match.Groups["gistid"].Value;
				var gistData = gistGetter(gistId);
				var fileName = match.Groups["file"].Success
								? match.Groups["file"].Value
								: null;
				var content = string.Empty;
				var url = gistData["html_url"].Value<string>();
				if (fileName != null) {
					var file = (JObject)gistData["files"][fileName];
					content = ContentToHtml(file);
				}
				else {
					foreach (JProperty fileProp in gistData["files"]) {
						var file = fileProp.Value.Value<JObject>();
						content += ContentToHtml(file);
					}
				}
				content += "<br/>"
					+ "<a href='" + Microsoft.Security.Application.Encoder.HtmlAttributeEncode(url) + "' title='I &hearts; github'>"
					+ "(see the most recent version of this gist)</a>";

				content = "<p>" + content + "</p>";
				return content;
			}

			catch (Exception ex) {
				return match.ToString();
			}
		});
	}

}