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From: Philipp Stephani
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Subject: bug#29343: 27.0.50;
Match data doesn't contain elements for non-matched subgroups
Date: Fri, 19 Apr 2019 20:22:23 +0200
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To: Noam Postavsky
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Am Sa., 17. M=C3=A4rz 2018 um 01:37 Uhr schrieb Noam Postavsky :
>
> Philipp Stephani writes:
>
> > $ emacs -Q -batch -eval '(progn (string-match "^\\(a\\)?\\(b\\)\\(c\\)?=
$" "b") (print (match-data)))'
> > (0 1 nil nil 0 1)
> >
> > Note that neither the `a` nor the `c` group matched, but there are
> > entries for `a` in `match-data`, but not for `c`. This makes working
> > with the match data unnecessarily hard because its length depends on
> > whether certain optional groups have matched or not. I haven't seen an=
y
> > discussion about this behavior in either the manual or the docstring. =
I
> > think the match data in this case should be (0 1 nil nil 0 1 nil nil).
>
> You can get that result by passing a list of the expected length as the
> REUSE argument to match-data:
True, but that also requires knowing the expected length. In the most
general case this should work for unknown regular expressions.