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bug#31584: 27.0.50; Document again what match re-search-backward finds
From: |
Michael Heerdegen |
Subject: |
bug#31584: 27.0.50; Document again what match re-search-backward finds |
Date: |
Fri, 25 May 2018 00:47:49 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux) |
Noam Postavsky <npostavs@gmail.com> writes:
> The docstring should definitely be clarified, but technically it can
> still be answered, if you read very carefully:
>
> (re-search-backward REGEXP &optional BOUND NOERROR COUNT)
>
> Search backward from point for regular expression REGEXP.
> This function is almost identical to ‘re-search-forward’, except that
> by default it searches backward instead of forward, and the sign of
> COUNT also indicates exactly the opposite searching direction.
>
> (re-search-forward REGEXP &optional BOUND NOERROR COUNT)
>
> [...]
> With COUNT positive/negative, the match found is [...] located
> entirely after/before the origin of the search.
You mean the sentence about the COUNT arg? Yes, _very_ carefully.
> It is greedy:
>
> (with-temp-buffer
> (insert "xxxxyyyy")
> (and (re-search-backward "x+y*" nil t)
> (match-string 0))) ;=> "xyyyy"
>
> Non-greedy wouldn't match any "y"s. It's a bit tricky to explain both
> correctly and clearly...
Ok, good example. You convinced me that the sentence we once had was
actually quite good.
Michael.
- bug#31584: 27.0.50; Document again what match re-search-backward finds, Michael Heerdegen, 2018/05/24
- bug#31584: 27.0.50; Document again what match re-search-backward finds, Eric Abrahamsen, 2018/05/24
- bug#31584: 27.0.50; Document again what match re-search-backward finds, Michael Heerdegen, 2018/05/24
- bug#31584: 27.0.50; Document again what match re-search-backward finds, Noam Postavsky, 2018/05/24
- bug#31584: 27.0.50; Document again what match re-search-backward finds,
Michael Heerdegen <=
- bug#31584: 27.0.50; Document again what match re-search-backward finds, Noam Postavsky, 2018/05/24
- bug#31584: 27.0.50; Document again what match re-search-backward finds, Michael Heerdegen, 2018/05/24
- bug#31584: 27.0.50; Document again what match re-search-backward finds, Noam Postavsky, 2018/05/24
- bug#31584: 27.0.50; Document again what match re-search-backward finds, Eric Abrahamsen, 2018/05/24
- bug#31584: 27.0.50; Document again what match re-search-backward finds, Michael Heerdegen, 2018/05/24
- bug#31584: 27.0.50; Document again what match re-search-backward finds, Noam Postavsky, 2018/05/24
- bug#31584: 27.0.50; Document again what match re-search-backward finds, Michael Heerdegen, 2018/05/24
- bug#31584: 27.0.50; Document again what match re-search-backward finds, Eli Zaretskii, 2018/05/25
- bug#31584: 27.0.50; Document again what match re-search-backward finds, Noam Postavsky, 2018/05/25
- bug#31584: 27.0.50; Document again what match re-search-backward finds, Eric Abrahamsen, 2018/05/24