(bibtex-reference-head): Allow whitespace after the open paren.

diff --git a/lisp/textmodes/bibtex.el b/lisp/textmodes/bibtex.el
index 645cb1ceb67afb7b9a6f2871419350b2374a96c0..ae9b0c42d76f862d721cfa37b9d1e6c8338b37de 100644 (file)
--- a/lisp/textmodes/bibtex.el
+++ b/lisp/textmodes/bibtex.el
@@ -695,7 +695,7 @@ See the documentation of function bibtex-generate-autokey for further detail.")
 (defconst bibtex-reference-head
   (concat "^\\( \\|\t\\)*\\("
          bibtex-reference-type
-         "\\)[ \t]*[({]\\("
+         "\\)[ \t]*[({][ \t]*\\("
          bibtex-reference-key
          "\\)"))
 ;; Regexp defining format of the header line of a BibTeX reference