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bug#32328: match-beginning: return nil if search failed


From: Basil L. Contovounesios
Subject: bug#32328: match-beginning: return nil if search failed
Date: Wed, 01 Aug 2018 17:39:46 +0300
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/27.0.50 (gnu/linux)

Andreas Röhler <address@hidden> writes:

> match-beginning tells: Return value is undefined if the last search failed.
>
> Consider it a gain if it returns nil when failing.

I think match-string already implicitly relies on the suggested
behaviour; compare its docstring:

  Value is nil if NUMth pair didn't match, or there were less than NUM pairs.

with its implementation:

  (if (match-beginning num)
      (if string
          (substring string (match-beginning num) (match-end num))
        (buffer-substring (match-beginning num) (match-end num))))

-- 
Basil





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