Difference between * and + in regex javascript

Question

Both giving the same result so what is the difference between "*" and "+" symbol. How would I know which one to use.

var str= "oofo fooloo"
var StarSymbol= str.match(/fo*/g);
var PlusSymbol= str.match(/fo+/g)
console.log(StarSymbol)  // ["fo", "foo"]
console.log(PlusSymbol) // ["fo", "foo"]

fiddle

Answer 1

You are asking the same question again. So let me explain.

var str= "oofo fooloo"
var StarSymbol= str.match(/fo*/g);
var PlusSymbol= str.match(/fo+/g)
console.log(StarSymbol)  // ["fo", "foo"]
console.log(PlusSymbol) // ["fo", "foo"]

Ya, both gives the same result here(for this input) but fo* would match f alone where fo+ would not. * repeats the previous token zero or more times where + repeat the previous token one or more times. So this expects the previous token to be repeated atleast one time.

Example:

> var str= "f"
undefined
> str.match(/fo*/g);
[ 'f' ]
> str.match(/fo+/g);
null
> 

Answer 2

o* search's for zero or more o's

o+ search's for one or more o's

go through tutorials

Answer 3

* means between 0 and infinite amount of times, while + means at least one (cannot be zero amount of times)

To be more verbose, * would be like writing {0,}, while + would be like writing {1,}