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[bug #60802] Make .substring handle an empty result


From: G. Branden Robinson
Subject: [bug #60802] Make .substring handle an empty result
Date: Mon, 5 Jul 2021 02:57:08 -0400 (EDT)
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0

Follow-up Comment #4, bug #60802 (project groff):

Here some older threads discussing .substring semantics.

The behavior was changed back in 2002; these threads discuss an earlier
implementation.

https://lists.gnu.org/archive/html/groff/2001-10/msg00165.html

This one features Werner seeking stable semantics for the request, which I
think we should stick to except arguably for the corner case originally raised
on the mailing list this year.

https://lists.gnu.org/archive/html/groff/2002-07/msg00035.html

Here's a discussion from 2014.

https://lists.gnu.org/archive/html/groff/2014-11/msg00224.html

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