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Re: Macro aborts even though regexp instance exists - Serious Bug

From: Kevin Rodgers
Subject: Re: Macro aborts even though regexp instance exists - Serious Bug
Date: Tue, 23 Oct 2012 21:54:19 -0600
User-agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.4; en-US; rv: Gecko/20120306 Thunderbird/3.1.20

On 10/22/12 2:40 PM, Swami Tota Ram Shankar wrote:
Hi emacs users,

I write a simple macro which works, however, it fails in a particular


to get into isearch-forward-regexp

and give a regexp like


It works for every TWO and ONE as long as there is a ONE ahead of TWO.
In the last instance, no ONE exists after TWO and it fails.

\|<=>  OR or disjunction.

Any solutions?

This is such a fundamental issue that I think its a bug. When the C-s
M-r  is used outside the macro definition, the cursor gladly returns
to the original position when OR is entered and proceeds forward from
there, but perhaps, the macro aborts.

It is not a bug: when ONE fails to match the buffer, C-s (which is designed
for interactive use, obviously) signals an error, which terminates the macro

That's because there is no way for C-s to know that you _might_ type \|TWO
after ONE.

So the solution is to make sure that the regexp is not complete after ONE:
C-s \(ONE\|TWO\)

I guess, this can lead to a lot of confusion and time wastage, if the
user is unaware of this and most likely to neglect it because its
contrary to normal usage.

Yes, there is a lot of confusion and wasted time when a user is not aware
of how to use a program.

I include more newsgroups because of the seriousness of this bug.

Whatever :-)

Kevin Rodgers
Denver, Colorado, USA

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