How do I swap substrings within a string?

Question

I am trying to swap all occurrences of a pair of substrings within a given string.

For example, I may want to replace all occurrences of \"coffee\" with \"tea\" and

Answer 1

You can use a function:

var str = "I like coffee more than I like tea";
var newStr = str.replace(/(coffee|tea)/g, function(x) {
   return x === "coffee" ? "tea" : "coffee";
});
alert(newStr); 

Running example