how can i get string between two commas? : <p>I have a string like:</p>

<p>43965.96000,16933.986,404689.986,5814892.171,77.464,<strong>52.47585589</strong>,13.59670032,77.464,0.675,-0.223</p>

<p>I want to just keep the string which is bold in characters between commas. How can I do that?</p>
