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sub foo { (my $text = $_[0]) =~ s/$_[1]/$_[2]->($1)/e;
          print $text; }

foo("This is test 1\n", qr/test (.*)/, sub{"fish $_[0]"});

sub foo { (my $text = $_[0]) =~ s/$_[1]/$_[2]->()/e;
          print $text; }

foo("This is test 1\n", qr/test (.*)/, sub{"fish $1"});