how to replace last occurrence of a word in javascript?

Question

for example:

var str=\"
hi
hi\";

to replace the last(second)
,

to change into \"<

Answer 1

I think you want this:

str.replace(/^(.*)
(.*?)$/, '$1$2')

This greedily matches everything from the start to a
, then a
, then ungreedily matches everything to the end.