How to parse string?

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C#

I am trying to parse the following input string for the my function below, but I keep getting the exception “Length of aA isnt matching length of bA”.

I have tried using regex to filter through but I am still struggling to get it parsed. Any suggestions would be very helpful. Thank you.

String a = Illiquidity option, credit model minted, Pricing service unveiled

string b = <P align=justify>RiskSpan has released a proprietary independent daily pricing service for structured products and mortgage assets. Real-time pricing and can process thousands of securities in virtually minutes, it says.</P><P align=justify>Joe Sturtevant, co-founder and pricing executive at RiskSpan, comments: "We are now pricing bonds in the manner in which a trader would and providing context that streamlines the audit process."</P>, <P align=justify>RiskSpan has released a proprietary independent daily pricing service for structured products and mortgage assets. Real-time pricing and can process thousands of securities in virtually minutes, it says.</P><P align=justify>Joe Sturtevant, co-founder and pricing executive at RiskSpan, comments: "We are now pricing bonds in the manner in which a trader would and providing context that streamlines the audit process."</P>

What I have tried:

   string a = testtitle();
   string b = testStory();

    string c = "";
    string results = "";

    string[] aA = a.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries);

   // Regex rgxPTag = new Regex("(<p>.*?<\\/p>)");
    Regex rgxPTag = new Regex("(<p>.*?<\\/p>)", RegexOptions.Singleline);
    string[] bA = rgxPTag.Matches(b).Cast<match>().Select(m => m.Groups[1].Value).ToArray();

    if (aA.Length == bA.Length)
    {

        for (int i = 0; i < aA.Length; i++)
        {
            DateTime dt = DateTime.Today;

            XDocument doc = new XDocument(
       new XDeclaration("1.0", "gb2312", string.Empty),
       new XElement("article",
           new XElement("status", "Approved"),
            new XElement("title", aA[i].ToString()),
             new XElement("subtitle", aA[i].ToString()),
              new XElement("synopsis", bA[i].ToString() + "..."),
               new XElement("url", c),
                new XElement("display_date", dt.ToShortDateString())
         ));
             results  = results  + Environment.NewLine + doc.ToString();

        }
        return results;
    }
    return "Length of aA isnt matching length of bA";


}