Merge from emacs--rel--22

[bpt/emacs.git] / lisp / gnus / gmm-utils.el

diff --git a/lisp/gnus/gmm-utils.el b/lisp/gnus/gmm-utils.el
index 71a0662..1d9f30c 100644 (file)
--- a/lisp/gnus/gmm-utils.el
+++ b/lisp/gnus/gmm-utils.el
@@ -49,6 +49,19 @@ jabbering all the time."
   :type 'integer
   :group 'gmm)
 
+;;;###autoload
+(defun gmm-regexp-concat (regexp)
+  "Potentially concat a list of regexps into a single one.
+The concatenation is done with logical ORs."
+  (cond ((null regexp)
+        nil)
+       ((stringp regexp)
+        regexp)
+       ((listp regexp)
+        (mapconcat (lambda (elt) (concat "\\(" elt "\\)"))
+                   regexp
+                   "\\|"))))
+
 ;;;###autoload
 (defun gmm-message (level &rest args)
   "If LEVEL is lower than `gmm-verbose' print ARGS using `message'.