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  1. or download this
    #!/usr/bin/perl
    
    ...
    $test =~ s/(?:(?:$reg|\n|[^\[\]])+?)(^(?:ELSIF|ELSE\s*\n).*\]|\])/\[$1
    +/sm;
    return $test;
    }
    
  2. or download this
    $ ./t.pl
    trying iffer... test:  a = /1/1
    ...
    3
    ]
    $
    
  3. or download this
    #!/usr/bin/perl
    
    ...
    $test =~ s/(?:(?:$reg|\n|[^\[\]])+?)(^(?:ELSIF|ELSE\s*\n).*\]|\])/\[$1
    +/sm;
    return $test;
    }
    
  4. or download this
    $ ./t.pl
    trying iffer... test:  a = /1/1
    ...
    trying iffer... test: 3
    ]
    $