Regex extract text between pattern

i need your help with a regex in javascript.

I've got an a-tag with follow pattern

<a href='#'>
  <!--:de-->some german text<!--:--><!--:en-->some english text<!--:-->
</a>

So, now i'm searching for a regular expression what extract me each part

 1. <!--:de-->some german text<!--:-->
 2. <!--:en-->some german text<!--:-->

Thanks VERY much in advance