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#A hierarchy of six classes is used: "|", "/\", "[]", "{}", 
#"()", and "<>". When two smushing sub-characters are from 
...
      | (?<=[/\\])      \0[|]
    }
    {}gx

reverse LIST

...
on a large hash, such as from a DBM file.

      %by_name = reverse %by_address;     # Invert the hash

                                     THE                      W. J. Yo
+uden
                                    NORMAL
...
            IT IS AN INDENSPENSIBLE TOOL FOR THE ANALYSIS AND THE
   INTERPRETATION OF THE BASIC DATA OBTAINED BY OBSERVATION AND EXPERI
+MENT

#use Test::Without::Module 'Mail::Mailer';

...
$ perl -MTest::Without::Module=Mail::Mailer mod23.pl
Mail/Mailer.pm did not return a true value at mod23.pl line 3.
BEGIN failed--compilation aborted at mod23.pl line 3.

Error:  Can't locate Net/IP.pm in @INC (@INC contains: /opt/src/CPAN/b
+uild/Net-DNS-0.55/blib/lib/5.8.5/i386-linux-thread-multi /opt/src/CPA
+N/build/Net-DNS-0.55/blib/lib/5.8.5 /opt/src/CPAN/build/Net-DNS-0.55/
+blib/lib/i386-linux-thread-multi /opt/src/CPAN/build/Net-DNS-0.55/bli
+b/lib/5.8.4 /opt/src/CPAN/build/Net-DNS-0.55/blib/lib/5.8.3 /opt/src/
+CPAN/build/Net-DNS-0.55/blib/lib/5.8.2 /opt/src/CPAN/build/Net-DNS-0.
+55/blib/lib/5.8.1 /opt/src/CPAN/build/Net-DNS-0.55/blib/lib/5.8.0 /op
+t/src/CPAN/build/Net-DNS-0.55/blib/lib /opt/src/CPAN/build/Net-DNS-0.
+55/blib/arch/5.8.5/i386-linux-thread-multi /opt/src/CPAN/build/Net-DN
+S-0.55/blib/arch/5.8.5 /opt/src/CPAN/build/Net-DNS-0.55/blib/arch/i38
+6-linux-thread-multi /opt/src/CPAN/build/Net-DNS-0.55/blib/arch/5.8.4
+ /opt/src/CPAN/build/Net-DNS-0.55/blib/arch/5.8.3 /opt/src/CPAN/build
+/Net-DNS-0.55/blib/arch/5.8.2 /opt/src/CPAN/build/Net-DNS-0.55/blib/a
+rch/5.8.1 /opt/src/CPAN/build/Net-DNS-0.55/blib/arch/5.8.0 /opt/src/C
+PAN/build/Net-DNS-0.55/blib/arch /usr/lib/perl5/5.8.5/i386-linux-thre
+ad-multi/5.8.5/i386-linux-thread-multi /usr/lib/perl5/5.8.5/i386-linu
+x-thread-multi/5.8.5 /usr/lib/perl5/5.8.5/i386-linux-thread-multi/i38
+6-linux-thread-multi /usr/lib/perl5/5.8.5/i386-linux-thread-multi/5.8
+.4 /usr/lib/perl5/5.8.5/i386-linux-thread-multi/5.8.3 /usr/lib/perl5/
+5.8.5/i386-linux-thread-multi/5.8.2 /usr/lib/perl5/5.8.5/i386-linux-t
+hread-multi/5.8.1 /usr/lib/perl5/5.8.5/i386-linux-thread-multi/5.8.0 
+/usr/lib/perl5/5.8.5/i386-linux-thread-multi /usr/lib/perl5/5.8.5/5.8
+.5/i386-linux-thread-multi /usr/lib/perl5/5.8.5/5.8.5 /usr/lib/perl5/
+5.8.5/i386-linux-thread-multi /usr/lib/perl5/5.8.5/5.8.4 /usr/lib/per
+l5/5.8.5/5.8.3 /usr/lib/perl5/5.8.5/5.8.2 /usr/lib/perl5/5.8.5/5.8.1 
+/usr/lib/perl5/5.8.5/5.8.0 /usr/lib/perl5/5.8.5 /usr/lib/perl5/site_p
+erl/5.8.5/i386-linux-thread-multi/5.8.5/i386-linux-thread-multi /usr/
+lib/perl5/site_perl/5.8.5/i386-linux-thread-multi/5.8.5 /usr/lib/perl
+5/site_perl/5.8.5/i386-linux-thread-multi/i386-linux-thread-multi /us
+r/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi/5.8.4 /usr/lib/pe
+rl5/site_perl/5.8.5/i386-linux-thread-multi/5.8.3 /usr/lib/perl5/site
+_perl/5.8.5/i386-linux-thread-multi/5.8.2 /usr/lib/perl5/site_perl/5.
+8.5/i386-linux-thread-multi/5.8.1 /usr/lib/perl5/site_perl/5.8.5/i386
+-linux-thread-multi/5.8.0 /usr/lib/perl5/site_perl/5.8.5/i386-linux-t
+hread-multi /usr/lib/perl5/site_perl/5.8.4/i386-linux-thread-multi/5.
+8.5/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.4/i386-linux
+-thread-multi/5.8.5 /usr/lib/perl5/site_perl/5.8.4/i386-linux-thread-
+multi/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.4/i386-lin
+ux-thread-multi/5.8.4 /usr/lib/perl5/site_perl/5.8.4/i386-linux-threa
+d-multi/5.8.3 /usr/lib/perl5/site_perl/5.8.4/i386-linux-thread-multi/
+5.8.2 /usr/lib/perl5/site_perl/5.8.4/i386-linux-thread-multi/5.8.1 /u
+sr/lib/perl5/site_perl/5.8.4/i386-linux-thread-multi/5.8.0 /usr/lib/p
+erl5/site_perl/5.8.4/i386-linux-thread-multi /usr/lib/perl5/site_perl
+/5.8.3/i386-linux-thread-multi/5.8.5/i386-linux-thread-multi /usr/lib
+/perl5/site_perl/5.8.3/i386-linux-thread-multi/5.8.5 /usr/lib/perl5/s
+ite_perl/5.8.3/i386-linux-thread-multi/i386-linux-thread-multi /usr/l
+ib/perl5/site_perl/5.8.3/i386-linux-thread-multi/5.8.4 /usr/lib/perl5
+/site_perl/5.8.3/i386-linux-thread-multi/5.8.3 /usr/lib/perl5/site_pe
+rl/5.8.3/i386-linux-thread-multi/5.8.2 /usr/lib/perl5/site_perl/5.8.3
+/i386-linux-thread-multi/5.8.1 /usr/lib/perl5/site_perl/5.8.3/i386-li
+nux-thread-multi/5.8.0 /usr/lib/perl5/site_perl/5.8.3/i386-linux-thre
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+/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.2/i386-linux-th
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+ti/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.2/i386-linux-
+thread-multi/5.8.4 /usr/lib/perl5/site_perl/5.8.2/i386-linux-thread-m
+ulti/5.8.3 /usr/lib/perl5/site_perl/5.8.2/i386-linux-thread-multi/5.8
+.2 /usr/lib/perl5/site_perl/5.8.2/i386-linux-thread-multi/5.8.1 /usr/
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+5/site_perl/5.8.2/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.
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+_perl/5.8.1/i386-linux-thread-multi/i386-linux-thread-multi /usr/lib/
+perl5/site_perl/5.8.1/i386-linux-thread-multi/5.8.4 /usr/lib/perl5/si
+te_perl/5.8.1/i386-linux-thread-multi/5.8.3 /usr/lib/perl5/site_perl/
+5.8.1/i386-linux-thread-multi/5.8.2 /usr/lib/perl5/site_perl/5.8.1/i3
+86-linux-thread-multi/5.8.1 /usr/lib/perl5/site_perl/5.8.1/i386-linux
+-thread-multi/5.8.0 /usr/lib/perl5/site_perl/5.8.1/i386-linux-thread-
+multi /usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi/5.8.5/i3
+86-linux-thread-multi /usr/lib/perl5/site_perl/5.8.0/i386-linux-threa
+d-multi/5.8.5 /usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi/
+i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.0/i386-linux-thr
+ead-multi/5.8.4 /usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-mult
+i/5.8.3 /usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi/5.8.2 
+/usr/lib/perl5/site_perl/5.8.0/i386-linux-thread-multi/5.8.1 /usr/lib
+/perl5/site_perl/5.8.0/i386-linux-thread-multi/5.8.0 /usr/lib/perl5/s
+ite_perl/5.8.0/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.5
+/5.8.5/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.5/5.8.5 /
+usr/lib/perl5/site_perl/5.8.5/i386-linux-thread-multi /usr/lib/perl5/
+site_perl/5.8.5/5.8.4 /usr/lib/perl5/site_perl/5.8.5/5.8.3 /usr/lib/p
+erl5/site_perl/5.8.5/5.8.2 /usr/lib/perl5/site_perl/5.8.5/5.8.1 /usr/
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+ib/perl5/site_perl/5.8.4/5.8.5/i386-linux-thread-multi /usr/lib/perl5
+/site_perl/5.8.4/5.8.5 /usr/lib/perl5/site_perl/5.8.4/i386-linux-thre
+ad-multi /usr/lib/perl5/site_perl/5.8.4/5.8.4 /usr/lib/perl5/site_per
+l/5.8.4/5.8.3 /usr/lib/perl5/site_perl/5.8.4/5.8.2 /usr/lib/perl5/sit
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+5/site_perl/5.8.4 /usr/lib/perl5/site_perl/5.8.3/5.8.5/i386-linux-thr
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+rl/5.8.3/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.3/5.8.4
+ /usr/lib/perl5/site_perl/5.8.3/5.8.3 /usr/lib/perl5/site_perl/5.8.3/
+5.8.2 /usr/lib/perl5/site_perl/5.8.3/5.8.1 /usr/lib/perl5/site_perl/5
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+b/perl5/site_perl/5.8.2/5.8.2 /usr/lib/perl5/site_perl/5.8.2/5.8.1 /u
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+hread-multi /usr/lib/perl5/site_perl/5.8.1/5.8.4 /usr/lib/perl5/site_
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+r/lib/perl5/vendor_perl/5.8.4/i386-linux-thread-multi/5.8.5/i386-linu
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+/usr/lib/perl5/vendor_perl/5.8.1/5.8.5 /usr/lib/perl5/vendor_perl/5.8
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+/usr/lib/perl5/vendor_perl/5.8.0/5.8.4 /usr/lib/perl5/vendor_perl/5.8
+.0/5.8.3 /usr/lib/perl5/vendor_perl/5.8.0/5.8.2 /usr/lib/perl5/vendor
+_perl/5.8.0/5.8.1 /usr/lib/perl5/vendor_perl/5.8.0/5.8.0 /usr/lib/per
+l5/vendor_perl/5.8.0 /usr/lib/perl5/vendor_perl/5.8.5/i386-linux-thre
+ad-multi /usr/lib/perl5/vendor_perl/5.8.5 /usr/lib/perl5/vendor_perl/
+i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.4 /usr/lib/per
+l5/vendor_perl/5.8.3 /usr/lib/perl5/vendor_perl/5.8.2 /usr/lib/perl5/
+vendor_perl/5.8.1 /usr/lib/perl5/vendor_perl/5.8.0 /usr/lib/perl5/ven
+dor_perl ./5.8.5/i386-linux-thread-multi ./5.8.5 ./i386-linux-thread-
+multi ./5.8.4 ./5.8.3 ./5.8.2 ./5.8.1 ./5.8.0 . /usr/lib/perl5/5.8.5/
+i386-linux-thread-multi /usr/lib/perl5/5.8.5 /usr/lib/perl5/site_perl
+/5.8.5/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.4/i386-li
+nux-thread-multi /usr/lib/perl5/site_perl/5.8.3/i386-linux-thread-mul
+ti /usr/lib/perl5/site_perl/5.8.2/i386-linux-thread-multi /usr/lib/pe
+rl5/site_perl/5.8.1/i386-linux-thread-multi /usr/lib/perl5/site_perl/
+5.8.0/i386-linux-thread-multi /usr/lib/perl5/site_perl/5.8.5 /usr/lib
+/perl5/site_perl/5.8.4 /usr/lib/perl5/site_perl/5.8.3 /usr/lib/perl5/
+site_perl/5.8.2 /usr/lib/perl5/site_perl/5.8.1 /usr/lib/perl5/site_pe
+rl/5.8.0 /usr/lib/perl5/site_perl /usr/lib/perl5/vendor_perl/5.8.5/i3
+86-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.4/i386-linux-thr
+ead-multi /usr/lib/perl5/vendor_perl/5.8.3/i386-linux-thread-multi /u
+sr/lib/perl5/vendor_perl/5.8.2/i386-linux-thread-multi /usr/lib/perl5
+/vendor_perl/5.8.1/i386-linux-thread-multi /usr/lib/perl5/vendor_perl
+/5.8.0/i386-linux-thread-multi /usr/lib/perl5/vendor_perl/5.8.5 /usr/
+lib/perl5/vendor_perl/5.8.4 /usr/lib/perl5/vendor_perl/5.8.3 /usr/lib
+/perl5/vendor_perl/5.8.2 /usr/lib/perl5/vendor_perl/5.8.1 /usr/lib/pe
+rl5/vendor_perl/5.8.0 /usr/lib/perl5/vendor_perl .) at /opt/src/CPAN/
+build/Net-DNS-0.55/blib/lib/Net/DNS/Resolver/Base.pm line 24.

Params::Validate::validate calls
$VAR1 = {
...
          'DateTime::new' => 4067,
          'DateTime::Duration::new' => 2325
        };

for my $i (43, 47..57, 61, 65..90, 97..122){
    my $x = rand()*26;
...
    push @G, map($F{$_}, split('', $_));
}
for(my $i=0;$i<26;$i++){

#!/usr/bin/perl -w -l -n -a -F <-
BEGIN{
...
    print $URI, ': ', $H{$URI};
  }
}

$ perl -wle "open(FOO, '-|') || exec 'perl someprog';  print <FOO>"
%DCL-W-IVVERB, unrecognized command verb - check validity and spelling
+ \$\
...
$ perl -v

This is perl, v5.7.2 built for VMS_AXP