GNU bug report logs - #37659
rx additions: anychar, unmatchable, unordered-or

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Message #88 received at 37659 <at> debbugs.gnu.org (full text, mbox):

From: Mattias Engdegård <mattiase <at> acm.org>
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: psainty <at> orcon.net.nz, eggert <at> cs.ucla.edu, 37659 <at> debbugs.gnu.org
Subject: Re: bug#37659: rx additions: anychar, unmatchable, unordered-or
Date: Thu, 13 Feb 2020 23:23:01 +0100

13 feb. 2020 kl. 20.30 skrev Eli Zaretskii <eliz <at> gnu.org>:

> Fine with me, thanks.

Thank you, pushed.

Now only the 'compositionality' patch remains. As noted it could be done on master, but since it is motivated by user-defined forms which were introduced in Emacs 27, I'd rather like it to be done in that branch.

It simply seems a bit incomplete otherwise. Users read about the longest-match guarantee of 'or', and of user-definitions, and look for a way of combining the two. Perhaps they try

(rx-let ((arith-op (or "+" "-" "*" "/"))
         (assign-op (or "=" "+=" "-=" "*=" "/="))
         (op (or arith-op assign-op)))
...)

which doesn't quite work for matching "+=", say.

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