X-Git-Url: https://code.delx.au/gnu-emacs/blobdiff_plain/20aa42e8204f8f0139ba3880cb32ddf88acc9bf4..ff9de7b38a3a316529c73e36645182055e2addc4:/doc/lispref/searching.texi

diff --git a/doc/lispref/searching.texi b/doc/lispref/searching.texi
index adaf43159a..644716a95c 100644
--- a/doc/lispref/searching.texi
+++ b/doc/lispref/searching.texi
@@ -1,6 +1,6 @@
 @c -*-texinfo-*-
 @c This is part of the GNU Emacs Lisp Reference Manual.
-@c Copyright (C) 1990-1995, 1998-1999, 2001-2015 Free Software
+@c Copyright (C) 1990-1995, 1998-1999, 2001-2016 Free Software
 @c Foundation, Inc.
 @c See the file elisp.texi for copying conditions.
 @node Searching and Matching
@@ -1151,16 +1151,17 @@ comes back" twice.
 @end example
 @end defun
 
-@defun looking-back regexp &optional limit greedy
+@defun looking-back regexp limit &optional greedy
 This function returns @code{t} if @var{regexp} matches the text
 immediately before point (i.e., ending at point), and @code{nil} otherwise.
 
 Because regular expression matching works only going forward, this is
 implemented by searching backwards from point for a match that ends at
 point.  That can be quite slow if it has to search a long distance.
-You can bound the time required by specifying @var{limit}, which says
-not to search before @var{limit}.  In this case, the match that is
-found must begin at or after @var{limit}.  Here's an example:
+You can bound the time required by specifying a non-@code{nil} value
+for @var{limit}, which says not to search before @var{limit}.  In this
+case, the match that is found must begin at or after @var{limit}.
+Here's an example:
 
 @example
 @group
@@ -1178,9 +1179,9 @@ comes back" twice.
 
 If @var{greedy} is non-@code{nil}, this function extends the match
 backwards as far as possible, stopping when a single additional
-previous character cannot be part of a match for regexp.  When the
-match is extended, its starting position is allowed to occur before
-@var{limit}.
+previous character cannot be part of a match for @var{regexp}.  When
+the match is extended, its starting position is allowed to occur
+before @var{limit}.
 
 @c http://debbugs.gnu.org/5689
 As a general recommendation, try to avoid using @code{looking-back}
@@ -1804,6 +1805,14 @@ Answer this question and all subsequent questions in the series with
 @item backup
 Move back to the previous place that a question was asked about.
 
+@item undo
+Undo last replacement and move back to the place where that
+replacement was performed.
+
+@item undo-all
+Undo all replacements and move back to the place where the first
+replacement was performed.
+
 @item edit
 Enter a recursive edit to deal with this question---instead of any
 other action that would normally be taken.