regex to match all cdata elements and replace data from existing search term .net

<issn2><![CDATA[&#x000E9;]]>Modern data is needed with dummy content. we are good to go.</issn2>
<issn3><![CDATA[&#x00027;]]>Modern data is needed with dummy content. we are good to go.</issn3>

output should :

<issn2>&#x000E9;Modern data is needed with dummy content. we are good to go.</issn2>
<issn3>&#x00027;Modern data is needed with dummy content. we are good to go.</issn3>