Re^3: $1[ (or "Does an array @1 exist in Perl ?

One can use "$1[$2]$3[$4]$5" expecting no array (with impossible names according doc) interpretation.

No, the documentation does not say they are impossible at all:

Perl variable names may also be a sequence of digits, a single punctuation character, or the two-character sequence: ^ (caret or CIRCUMFLEX ACCENT) followed by any one of the characters [][A-Z^_?\] . These names are all reserved for special uses by Perl; for example, the all-digits names are used to hold data captured by backreferences after a regular expression match.

So @1, @2, @1066, etc. are all perfectly valid. They are just reserved for special uses by Perl.

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Re^4: $1[ (reserved != allowed) by LanX (Saint) on Oct 11, 2017 at 15:31 UTC
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!}	[reply] [d/l] [select]
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


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