From: Junio C Hamano <gitster@pobox.com>
Date: Fri, 07 Jun 2013 02:30:10 GMT
Subject: Re: [PATCH 02/18] Change style of some regular expressions to make them clearer
Message-ID: <7vbo7iwt3h.fsf@alter.siamese.dyndns.org>
In-Reply-To: <CAPig+cQvWJ8RRsqKEMooV_AntTBZ1Pi=WA_1LFU955J+9jDzTg@mail.gmail.com>

Eric Sunshine <sunshine@sunshineco.com> writes:

>> -                       if (my ($child, $parents) = $line =~ m/^-?([a-f0-9]+) ([a-f0-9 ]+)/) {
>> -                               foreach my $parent (split(' ', $parents)) {
>> +                       if (my ($child, $parents) = $line =~ /^-?([a-f0-9]+) ([a-f0-9 ]+)/) {
>> +                               foreach my $parent (split(/ /, $parents)) {
>
> This is a behavior-altering change. split(' ',...) is handled as a
> special case[*1*] which strips leading whitespace and then splits on
> /\s+/ (run of whitespace). Changing it to split(/ /,...) makes it
> match only a single space (rather than a run of whitespace).

I initially had the same reaction, but this is reading the output of
the "rev-list --parents" command, whose fields are separated by one
SP each, so there is indeed no behaviour change.