Dear Monks,

I need to extract substrings delimited by balanced parentheses, and I installed Regexp::Common to see what it could do. Here is a test program that embeds an example from the doc (https://metacpan.org/pod/Regexp::Common). 

#!/usr/bin/env perl
use v5.36;
use Regexp::Common;
 
while (<>) {
    /$RE{num}{real}/               and print q{a number};
    /$RE{quoted}/                  and print q{a ['"`] quoted string};
   m[$RE{delimited}{-delim=>'/'}]  and print q{a /.../ sequence};
    /$RE{balanced}{-parens=>'()'}/ and print q{balanced parentheses};
    /$RE{profanity}/               and print q{a #*@%-ing word};
}

[download]
Unfortunately, it won't compile: 
Multidimensional hash lookup is disabled at /Users/chap/private/perl/r
+egcommon line 8, near "'/'}"

[download]
It seems that, at some point, it was permissible to write $foo{$bar, $frog}, which was understood by Perl to mean $foo{"$bar$;$frog"}, but this was later disabled (perl 5.33?). And I assume that {-delim=>'/'} is what's triggering the error, with '=>' being a fat comma.

Is Regexp::Common out of date? None of the 28 open issues seems to address this condition. Is there a way to make it work under v5.36 and beyond? Is there a successor to Regexp::Common?

(Incidentally, it seems from searching for "perl multidimensional hash" that most people take this to mean simply chaining keys, a la $thing{$x}{$y}{$z}, which of course is alive and well, as opposed to forming a "composite key" as in $thing{$x, $y, $z}).

Update 1: replaced literals with variables in examples of multidimensional hash lookups, per jwkrahn's comment below.

In reply to Regexp::Common and "multidimensional hash lookup disabled" (v5.36+) by ibm1620

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