Hi Sorin
Yes, it works in oXygen 14! Thank you very much for your help!
The only problem I have now is how I can explain this to my (DITA) students and how I can convince them to use regular expressions. Most of them are new to DITA and XML. Also, when you search for some text, you don't know where the end-of-line character is, so to find the topic in the example below, you may have to replace every space with (\s+) in the Find/Replace in Files dialog:
Find: consists(\s+)of(\s+)the(\s+)following(\s+)zones
if the topic contains:
<p status="changed">The body of the <keyword
conref="_conref_library.xml#topic_qjt_sdx_1f/keyword_wms_s2x_1f"/> consists of
the following zones:</p>