Unescape XML tags only. Keep content escaped

I have to consume a WS that sends its XML data inside a CDATA tag, the output I get is the following:

<parent>
    <child1>
        <xmltag1>4 años < 8 </xmltag1>
        <xmltag2>3 años < 12 </xmltag2>
    <child1>
</parent>

I have to format this data to an usable XML so I can work with it.

It should look like:

<parent>
    <child1>
        <xmltag1>4 años &lt; 8 </xmltag1>
        <xmltag2>3 años &lt; 12 </xmltag2>
    <child>
</parent>

I have tried various java functions like: StringEscapeUtils.unescapeXml(string);

I guess there could be a way of getting that result by using regex

string.replaceAll("&lt;{0}>", "</{0}>");