Regex: how to split "a.b" to "a" ".b" in javascript

Question

I saw this Regex replace `a.b` to `a. b`? I don't understand it's for Python not for Javascript or it isn't well explained.

I know how to split "a.b" to ["a" "." "b"] with

regex = /(\.)/;
test = "a.b";
results = test.split(regex);

I can't see what regex to get

["a" ".b"]

Answer 1

You could split by the positive lookahead of a dot.

var string = "a.b",
result = string.split(/(?=\.)/);

console.log(result);