JSFiddle - React, Tailwind, and code Playground

JavaScript

var inner ='<thead><tr><td><b>Titel&nbsp;</b></td><td><b>Digitalisierungsdatum&nbsp;</b></td><td><b>Erstellungsdatum&nbsp;</b></td><td><b>Art&nbsp;</b></td><td><b>Kommentar</b></td></tr><tr height="27" class="Anlagen_tr"><td><a href="../../Lists/anlagen/Desert.jpg" target="_blank">Desert.jpg&nbsp;</a></td><td>17.08.2015</td><td>17.08.2015</td><td>Radiologiebericht</td><td>58481</td><td><img style="margin-top: 2px;" onclick="removeAnlage(this)" src="/_layouts/15/images/CMSRemoveLink.gif"></td></tr><tr height="27" class="Anlagen_tr"><td><a href="../../Lists/anlagen/Hydrangeas.jpg" target="_blank">Hydrangeas.jpg&nbsp;</a></td><td> </td><td> </td><td>Radiologiebericht</td><td></td><td><img style="margin-top: 2px;" onclick="removeAnlage(this)" src="/_layouts/15/images/CMSRemoveLink.gif"></td></tr></thead>';

var tmp = inner.replace(/<img .*>/g,"REPLACED"); 
alert(tmp);