RE: Anchoring a RE in a string

[Drew Adams]

> Unfortunately, its only mention in emacs or elisp info is Gerd
> Moellmann's authorship notice: "[...] `rx.el', a regular expression
> constructor. ".  Take a look at C-h f rx RET

If you cannot find something in the manuals, try searching for it at EmacsWiki
(or Google after that).  Entering "rx" in the wiki search field shows this page
as the first search hit: http://emacswiki.org/emacs/rx.

(That of course is not intended to mean that something should not also be
mentioned in the manuals.  It's just intended to help you find information.  The
wiki is another resource, like help-gnu-emacs@gnu.org.)