I want to match this:
Line number On/Off | Expand/Contract
 
<!-- THE BEGINNING -->
<div class="whatever">
<p>Some <u>Random</u> HTML in here</p>
</div>
<!-- THE END -->
 


This is the regex i thought of but it doesn't match anything... why?

Line number On/Off | Expand/Contract
|<!--\sTHE\sBEGINNING\s-->.*?<!--\sTHE\sEND\s-->|m