Re^4: $1[ (reserved != allowed)

in reply to Re^3: $1[ (or "Does an array @1 exist in Perl ? - Yes!")
in thread $1[

One can reserve @1 , but the parser should croak or at least warn as long as the reservation wasn't filled with meaning.

I think %+ and %- are good examples of taking advantage of reserved variables after introducing named captures in regex. ( added in Perl v5.10.0)

@1 has no special meaning and doesn't need to be declared under strict!

As a side note, it's possible to use @a or %b without explicit declaration under strict ... that's really not optimal and really should be documented.

Cheers Rolf
_{(addicted to the Perl Programming Language and ☆☆☆☆ :)

Je suis Charlie!}

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Re^5: $1[ (reserved != allowed) by rsFalse (Chaplain) on Oct 28, 2017 at 13:30 UTC
By the way, today I've found that in Modern_Perl book, as an example is given `@3` as incorrect name: `These are invalid Perl identifiers: my $invalid name; # space is invalid my @3; # cannot start with number my %~flags; # symbols invalid in name` [download] (from 4th edition, page #13)	[reply] [d/l] [select]
Re^6: $1[ (reserved != allowed) by LanX (Saint) on Oct 28, 2017 at 13:55 UTC
> in Modern_Perl book, as an example is given @3 as incorrect name: `These are invalid Perl identifiers: ... my @3; # cannot start with number` [download] Which is correct, cause `my` declares a lexical var, no exceptions needed there `DB<475> my @3 =(1,2,3) Can't use global @3 in "my" at (eval 679)[C:/Perl_64/lib/perl5db.pl:64 +6] line 2, ...` [download] Cheers Rolf _{(addicted to the Perl Programming Language and ☆☆☆☆ :) Je suis Charlie!}	[reply] [d/l] [select]
Re^7: $1[ (reserved != allowed) by rsFalse (Chaplain) on Oct 28, 2017 at 15:59 UTC
Ah, ok, now it is more clear for me. Thank you.	[reply]

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