regex - javascript - Better Way to Escape Dollar Signs in the String Used By String.prototype.replace

Question

I want to replace a string by another. I found when the replaceValue contains "$", the replace will fail. So I am trying to escape "$" by "$$" first. The code is looks like this:

var str = ..., reg = ...;
function replaceString(replaceValue) {
  str.replace(reg, replaceValue.replace(/$/g, '$$$$'));
}

But I think it is ugly since I need to write 4 dollar signs.

Is there any other charactors that I need to escape? And is there any better way to do this?

Answer 1

There is a way to call replace that allows us not to worry about escaping anything.

var str = ..., reg = ...;
function replaceString(replaceValue) {
  return str.replace(reg, function () { return replaceValue });
}