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                   $` is the same as "substr($var, 0, $-[0])"
               $& is the same as "substr($var, $-[0], $+[0] - $-[0])"
               $' is the same as "substr($var, $+[0])"
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    sub  prematch (;$) { substr((@_ ? $_[0] : $_), 0, $-[0]) }
sub     match (;$) { substr((@_ ? $_[0] : $_), $-[0], $+[0] - $-[0]) }
...
argument is given.

=cut