--- emacs-snapshot-20090207/lisp/textmodes/bibtex.el~	2009-01-17 16:58:53.000000000 +0200
+++ emacs-snapshot-20090207/lisp/textmodes/bibtex.el	2009-02-19 15:33:43.000000000 +0200
@@ -746,7 +746,7 @@
 
 (defcustom bibtex-autokey-titleword-ignore
   '("A" "An" "On" "The" "Eine?" "Der" "Die" "Das"
-    "[^[:upper:]].*" ".*[^[:upper:]0-9].*")
+    "[^[:upper:]].*" ".*[^[:upper:][:lower:]0-9].*")
   "Determines words from the title that are not to be used in the key.
 Each item of the list is a regexp.  If a word of the title matches a
 regexp from that list, it is not included in the title part of the key.
@@ -2307,6 +2307,10 @@
     ;; gather words from titlestring into a list.  Ignore
     ;; specific words and use only a specific amount of words.
     (let ((counter 0)
+	  (re (concat "\\`\\(?:"
+		      (mapconcat #'identity
+				 bibtex-autokey-titleword-ignore "\\|")
+		      "\\)\\'") )
           titlewords titlewords-extra word)
       (while (and (or (not (numberp bibtex-autokey-titlewords))
                       (< counter (+ bibtex-autokey-titlewords
@@ -2316,12 +2320,10 @@
               titlestring (substring titlestring (match-end 0)))
         ;; Ignore words matched by one of the elements of
         ;; `bibtex-autokey-titleword-ignore'
-        (unless (let ((lst bibtex-autokey-titleword-ignore))
-                  (while (and lst
-                              (not (string-match (concat "\\`\\(?:" (car lst)
-                                                         "\\)\\'") word)))
-                    (setq lst (cdr lst)))
-                  lst)
+	;;;;;;;; XXX FIXME: case-fold-search should be unnecessary here
+	;; [[:upper:]] and [[:lower:]] should be unaffected by case folding
+        (unless (let ((case-fold-search nil))
+		  (string-match re word) )
           (setq counter (1+ counter))
           (if (or (not (numberp bibtex-autokey-titlewords))
                   (<= counter bibtex-autokey-titlewords))