Remove the optional KEEP-ORDER argument to regexp-opt

This argument was added for the 'or' clause in rx, but it turned out
to be a bad idea (bug#37659), and there seems to be little other use
for it.

* lisp/emacs-lisp/regexp-opt.el (regexp-opt): Remove KEEP-ORDER.
* doc/lispref/searching.texi (Regexp Functions):
* etc/NEWS: Remove it from the documentation.
* test/lisp/emacs-lisp/regexp-opt-tests.el (regexp-opt-test--match-all)
(regexp-opt-test--check-perm, regexp-opt-test--explain-perm)
(regexp-opt-keep-order, regexp-opt-longest-match): Simplify test.

1 files changed, 0 insertions, 7 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 312869fe57e..380ac71260d 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -3527,13 +3527,6 @@ This is currently supported on GNUish hosts and on modern versions of
 MS-Windows.
 
 +++
-** The function 'regexp-opt' accepts an additional optional argument.
-By default, the regexp returned by 'regexp-opt' may match the strings
-in any order.  If the new third argument is non-nil, the match is
-guaranteed to be performed in the order given, as if the strings were
-made into a regexp by joining them with '\|'.
-
-+++
 ** The function 'regexp-opt', when given an empty list of strings, now
 returns a regexp that never matches anything, which is an identity for
 this operation.  Previously, the empty string was returned in this