From: Iain Barnett <iainspeed@...>
Date: 2010-07-27T09:55:15+09:00
Subject: Re: Regex ^ beginning not strong?

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On 26 Jul 2010, at 21:40, Robert Klemme wrote:
>=20
> I think you found a bug - probably related to referring to back =
references to named capturing groups:
>=20
>=20
>=20
> Frankly, I never used named capturing groups yet (simply for habit and =
compatibility).  It was probably a good choice so far.
>=20
> Kind regards
>=20
> 	robert
>=20

Thanks for checking that. While searching for more information on the =
Oniguruma engine I noticed that there was a CPAN library for running it =
under Perl, so I installed it and ran the same regexes against the perl =
engine, and it had the same results as Ruby. This indicates that it's a =
problem with the engine and not something Ruby is doing along the way, =
so I'll file a report with the Oniguruma team and include all your tests =
too and see what happens.

With Oniguruma:

$ perl -Mre::engine::Oniguruma -e '
if ( q(/\d\d\\d/)  =3D~ /^(?<delim>.)(?<pat>.+?)\g{delim}/ ) {
 while ( my ($key, $value) =3D each(%+) ) {
  print "$key =3D> $value\n";
 }
}
'
<nothing here>


Usual Perl engine:

$ perl  -e '
if ( q(/\d\d\\d/)  =3D~ /^(?<delim>.)(?<pat>.+?)\g{delim}/ ) {
 while ( my ($key, $value) =3D each(%+) ) {
  print "$key =3D> $value\n";
 }
}
'
pat =3D> \d\d\d
delim =3D> /

Regards,
Iain=

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