Re: Trimming strings, /emacs/lisp/emacs-lisp/subr-x.el modification

[Stefan Monnier <monnier@iro.umontreal.ca>]

>> I'm pretty sure surrounding the regexp in \(?:..\) will break no code
>> at all.  To me it's an absolute no-brainer that doesn't even merit
>> any discussion.
> That does not seem to be the case.  Johan has identified a case
> where a regexp that uses \| does not produce the same result as the "trim"
> argument of split-string whether it uses \( \) or not.

Of course it doesn't behave the same (otherwise, why bother changing
it): "I'm pretty sure surrounding the regexp in \(?:..\) will break no
code at all" doesn't mean that such code can't exist, but that I expect
such code not to exist in the wild (or if it exists, it *suffers* from
the current behavior rather than benefitting from it).


        Stefan