Small fix for he-line-search-regexp

* lisp/hippie-exp.el (he-line-search-regexp):
Handle comint-prompt-regexp containing subgroups.

Fixes: debbugs:17529

lisp/ChangeLog

+2014-05-23  Glenn Morris  <rgm@gnu.org>
+
+	* hippie-exp.el (he-line-search-regexp):
+	Handle comint-prompt-regexp containing subgroups.  (Bug#17529)
+
 2014-05-23  Stephen Berman  <stephen.berman@gmx.net>
 
 	* calendar/todo-mode.el: Remove dependence on auto-mode-alist,

lisp/hippie-exp.el

@@ -715,7 +715,7 @@ string).  It returns t if a new completion is found, nil otherwise."
 
 (defun he-line-search-regexp (pat strip-prompt)
   (if strip-prompt
-      (concat "\\(" comint-prompt-regexp "\\|^\\s-*\\)\\("
+      (concat "\\(" comint-prompt-regexp "\\|^\\s-*\\)\\(?2:"
 	      (regexp-quote pat)
 	      "[^\n]*[^ \t\n]\\)")
       (concat "^\\(\\s-*\\)\\("