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  1. or download this
    s/\[\[(\w+)\]\]/$helper->($1)/eg;
  2. or download this
    panic: sv_pos_b2u: bad byte offset at [...].
  3. or download this
    s/\[\[(\w+)\]\]/@{[$helper->($1)]}/g;
  4. or download this
    while (m/\[\[(\w+)\]\]/) {
    my $foo = $helper->($1);
    s/\[\[(\w+)\]\]/$foo/;
}