Pastable version of Modify relative urls in a css file

<pre class='prettyprint' language='cs'>public string Transform(string cssPath, string cssContent)
{
        return Regex.Replace(cssContent, @&quot;url\((?&lt;url&gt;.*?)\)&quot;, 
			match =&gt; FixUrl(cssPath, match),
			RegexOptions.IgnoreCase | RegexOptions.Singleline | RegexOptions.ExplicitCapture);
}

/// &lt;summary&gt;
/// Assume cssPath is /content/site.css:
///     * in: path/to/image.gif     -&gt; out: /content/path/to/image.gif
///     * in: ../path/to/image.gif  -&gt; out: /path/to/image.gif
///     * in: /path/to/image.gif    -&gt; out: /path/to/image.gif
/// &lt;/summary&gt;
private static string FixUrl(string cssPath, Match match)
{
	try
	{
		var url = match.Groups[&quot;url&quot;].Value;
		const string template = &quot;url({0})&quot;;
		if (url.StartsWith(&quot;/&quot;))
			return url;
		var adjustedResourceFolder = cssPath.Substring(0, resourcePath.LastIndexOf(&quot;/&quot;));
		var backFolderCount = Regex.Matches(url, @&quot;\.\./&quot;).Count;
		for (int i = 0; i &lt; backFolderCount; i++)
		{
			url = url.Substring(3);
			adjustedResourceFolder = adjustedResourceFolder.Substring(0,
				adjustedResourceFolder.LastIndexOf(&quot;/&quot;));
		}
		return string.Format(template, (adjustedResourceFolder + &quot;/&quot; + url));
	}
	catch (Exception ex)
	{
		return match.Value;
	}
}</pre>
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Pastable version of Modify relative urls in a css file