Commit 6cfe977d authored by Xue Fuqiao's avatar Xue Fuqiao

Refine documentation of `looking-back'.

* lisp/subr.el (looking-back): Do not recommend using looking-back.  (bug#5689)
* doc/lispref/searching.texi (Regexp Search): Refine.
parent 4ec3c268
2013-09-29 Xue Fuqiao <xfq.free@gmail.com>
* searching.texi (Regexp Search): Refine.
2013-09-22 Xue Fuqiao <xfq.free@gmail.com>
* nonascii.texi (Default Coding Systems): Typo fix.
......
......@@ -1146,13 +1146,7 @@ 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}.
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}.
found must begin at or after @var{limit}. Here's an example:
@example
@group
......@@ -1168,6 +1162,12 @@ comes back" twice.
@end group
@end example
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}.
@c http://debbugs.gnu.org/5689
As a general recommendation, try to avoid using @code{looking-back}
wherever possible, since it is slow. For this reason, there are no
......
2013-09-29 Xue Fuqiao <xfq.free@gmail.com>
* subr.el (looking-back): Do not recommend using looking-back.
2013-09-28 Alan Mackenzie <acm@muc.de>
Fix indentation/fontification of Java enum with "implements".
......
......@@ -3482,7 +3482,10 @@ If GREEDY is non-nil, extend 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
LIMIT."
LIMIT.
As a general recommendation, try to avoid using `looking-back'
wherever possible, since it is slow."
(let ((start (point))
(pos
(save-excursion
......
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