How can I match '&' with JS RegExp

I have a开发者_如何学编程n url-encoded url (so with & replaced to &), but I want to replace all the occurences of & back to & using javascript. Currently I'm using myStr.replace("/&/g", "&"), but that doesn't work (replaces nothing).

Thanks,

Lex

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myStr.replace(/&/g, "&")