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C# code behind example of using Regex to parse the XML response

This works fine since the response is for a single address element. Regex is obviously going to be a poor choice when an XML document contains multiple elements.

    protected void btnSubmit_Click(object sender, EventArgs e)
    {        
        if (txtAddress.Text.Length > 0)
        {
            lblAccuracy.Text = "";
            lblResult.Text = "";

            StringBuilder sb = new StringBuilder();

            sb.Append("http://maps.google.com/maps/geo?q=");
            sb.Append(Server.UrlEncode(txtAddress.Text));
            sb.Append("&output=xml&oe=utf8&sensor=false&key=*** ENTER YOUR GOOGLE API KEY HERE ***");

            XDocument responseXML = XDocument.Load(sb.ToString());

            string elementZip4 = "PostalCodeNumber";
            StringBuilder sbMatch = new StringBuilder();
            sbMatch.Append("<");
            sbMatch.Append(elementZip4);
            sbMatch.Append(">.*</");
            sbMatch.Append(elementZip4);
            sbMatch.Append(">");

            Match matchZip = Regex.Match(responseXML.ToString(), sbMatch.ToString());

            if (matchZip.Success)
            {                
                // Account for angle brackets in SubString expression
                lblResult.Text = matchZip.Value.Substring(elementZip4.Length + 2, 5);
            }

            Match matchAccuracy = Regex.Match(responseXML.ToString(), "<AddressDetails Accuracy=\"\\d\"");

            if (matchAccuracy.Success)
            {
                Match accVal = Regex.Match(matchAccuracy.Value, "\\d+");
                lblAccuracy.Text = "Accuracy = " + accVal.Value;
            }
        }        
    }