Make search in reftex-using-biblatex-p non-greedy.

* textmodes/reftex-parse.el (reftex-using-biblatex-p): Make search
for comment lines non-greedy and stopping at newlines to fix stack
overflows with large files.

lisp/ChangeLog

+2014-06-24  Leonard Randall  <leonard.a.randall@gmail.com>
+
+	* textmodes/reftex-parse.el (reftex-using-biblatex-p): Make search
+	for comment lines non-greedy and stopping at newlines to fix stack
+	overflows with large files.
+
 2014-06-24  Eli Barzilay  <eli@barzilay.org>
 	* calculator.el (calculator-last-input): drop 'ascii-character property

lisp/textmodes/reftex-parse.el

@@ -363,7 +363,7 @@ of master file."
       (member "biblatex" TeX-active-styles)
     ;; poor-man's check...
     (save-excursion
-      (re-search-forward "^[^%]*\\\\usepackage.*{biblatex}" nil t))))
+      (re-search-forward "^[^%\n]*?\\\\usepackage.*{biblatex}" nil t))))
 
 ;;;###autoload
 (defun reftex-locate-bibliography-files (master-dir &optional files)