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Postings from January 2005
Andrew (via RT) wrote:
>
> In perlre there is a section entitled "Creating custom RE
> engines". The sample code given maps \\ to \ inside regular
> expressions and thus prevents you from using \\ to represent a
> literal \. I think this is unintentional and a patch is included
> below.
Good catch.
> It might also be useful to put in some explanation as to why the
> \\ is required at all as I don't think it is immeadiately clear.
> That said I'm not volunteering to do the writing just now :-/
What about :
We must also take care of not escaping the legitimate \\Y|
sequence, hence the presence of '\\' in the conversion rules.
> --- perlre.pod.orig Tue Jan 13 21:46:44 2004
> +++ perlre.pod Sun Jan 23 13:31:26 2005
Thanks, applied to the development docs as change #23872.
> @@ -1288,7 +1288,7 @@
>
> sub invalid { die "/$_[0]/: invalid escape '\\$_[1]'"}
>
> - my %rules = ( '\\' => '\\',
> + my %rules = ( '\\' => '\\\\',
> 'Y|' => qr/(?=\S)(?<!\S)|(?!\S)(?<=\S)/ );
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