emacs-28 1cd1b28: * doc/misc/gnus.texi (Loose Threads): Use regexp-opt in example.

[Stefan Kangas]

branch: emacs-28
commit 1cd1b2835b5e35562c677c48dcf185bb73af4275
Author: Stefan Kangas <stefan@marxist.se>
Commit: Stefan Kangas <stefan@marxist.se>

    * doc/misc/gnus.texi (Loose Threads): Use regexp-opt in example.
---
 doc/misc/gnus.texi | 21 ++++++++-------------
 1 file changed, 8 insertions(+), 13 deletions(-)

diff --git a/doc/misc/gnus.texi b/doc/misc/gnus.texi
index 0c06558..6c892bc 100644
--- a/doc/misc/gnus.texi
+++ b/doc/misc/gnus.texi
@@ -7130,20 +7130,15 @@ as 10, you might consider setting this variable to 
something sensible:
 (setq gnus-simplify-ignored-prefixes
       (concat
        "\\`\\[?\\("
-       (mapconcat
-        'identity
-        '("looking"
-          "wanted" "followup" "summary\\( of\\)?"
-          "help" "query" "problem" "question"
-          "answer" "reference" "announce"
-          "How can I" "How to" "Comparison of"
-          ;; ...
-          )
-        "\\|")
+       (regexp-opt '("looking"
+                     "wanted" "followup" "summary" "summary of"
+                     "help" "query" "problem" "question"
+                     "answer" "reference" "announce"
+                     "How can I" "How to" "Comparison of"
+                     ;; ...
+                     ))
        "\\)\\s *\\("
-       (mapconcat 'identity
-                  '("for" "for reference" "with" "about")
-                  "\\|")
+       (regexp-opt '("for" "for reference" "with" "about"))
        "\\)?\\]?:?[ \t]*"))
 @end lisp