JS cross-browser solution for replacing '$' character with double '$$' character [duplicate]

Question

This question already has answers here:

Odd behavior replacing string with special replacement patterns in IE7|8 (1 answer)

`string.replace` weird behavior when using dollar sign ($) as replacement (3 answers)

Closed 9 years ago.

I have tried the following:

var stringToBeReplaced = "$";
var result = stringToBeReplaced.replace("$", "$$$$");

It works in modern browsers and I get "$$" in result. But to my surprise, when I run it over IE8 or older, I get "$$$$" in result. Is it a browser bug? Is there a cross browser solution avoiding browser detection? Just vainilla js please, no frameworks.

Answer 1

This probably works :

var result = stringToBeReplaced.replace(/(\$)/g, "$1$1");

but I must confess I have no IE to test.

Answer 2

You can try replace with callback:

'$'.replace('$', function($0) { return '$$'; });
"$$"

PS: I have tested it on Firefox, Chrome and IE8