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Try:

str = str.replace(/[""]/g, '"');
str = str.replace(/[‘’]/g,"'");

or to do it in one statement:

str = str.replace(/[""]/g, '"').replace(/[‘’]/g,"'");

I'm not a JavaScript expert, but in many languages strings are immutable - string "replacement" methods actually just return the new string instead of modifying the string in place. (Bizarrely enough, the few JavaScript string tutorials I've just looked up don't state a string's immutability - something I'd expect to be in the first or second paragraph of a C# or Java string tutorial.)