JavaScript String.Replace: Replacement Pattern for Full Match Reminder

This is my quick reminder to self to use
$&
instead of
$0
in JavaScript for Regular Expression replacement patterns when wishing to use the entire matched text.

Some browsers allow $0, but $& is officially documented (table 22, page 147) and supposed to work in all of them.

Example:
document.write("Hello World".replace(/^Hello/, "$& to the whole");

Output:
Hello to the whole World