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    $hash{a} = "go";
$string =~ s{\$(\w+)}{$hash{$1}}ge;
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    $hash->{a} = "go";
$string =~ s{\$(\w+)}{$$hash{$1}}ge;
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    $hash->{a} = "go";
$string =~ s{\$(\w+)}{$hash->{$1}}ge;