As a long-term user of Libre Office, Open office before that and Star Office even before that, I love this feature and have used a lot!

My boss used to give me grief about not using Microsoft Word and adhering to the "Corporate Standards", but with a Unix box and later a Linux box on my desk I was *far* more productive the way I was :-)

In my experience the earlier versions of Word were not good, though regular expression capability did appear at some point. Microsoft's version of regex is of course different from the more standard versions found under Unix &amp; Linux. Libre Office is much more conformant with the various standards I believe.