Function: rx--empty
rx--empty is a byte-compiled function defined in rx.el.gz.
Signature
(rx--empty)
Documentation
Regexp that never matches anything.
Source Code
;; Defined in /usr/src/emacs/lisp/emacs-lisp/rx.el.gz
(defun rx--empty ()
"Regexp that never matches anything."
(cons (list regexp-unmatchable) 'seq))