JS replacing all occurrences of string using variable

This question already has an answer here:

How do you use a variable in a regular expression? 16 answers

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The RegExp constructor takes a string and creates a regular expression out of it.

function name(str,replaceWhat,replaceTo){
    var re = new RegExp(replaceWhat, 'g');
    return str.replace(re,replaceTo);
}

If replaceWhat might contain characters that are special in regular expressions, you can do:

function name(str,replaceWhat,replaceTo){
    replaceWhat = replaceWhat.replace(/[-/^$*+?.()|[]{}]/g, '$&');
    var re = new RegExp(replaceWhat, 'g');
    return str.replace(re,replaceTo);
}

See Is there a RegExp.escape function in Javascript?

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Replace has an alternate form that takes 3 parameters and accepts a string:

function name(str,replaceWhat,replaceTo){
    str.replace(replaceWhat,replaceTo,"g");
}

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/replace

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