javascript Split string and keep separator as own array value

Question

I have strings which are just basic math equations. How can I split each number into an array and leave the operator as its own item in the array?

"123/12*312+4-2"

The output I would like to have is the following:

["123", "/", "12", "*", "312", "+", "4", "-", "2"]

I am using this:

str.split(/[^\d]/)

All other ways of doing this keep the separator but it is part of the number instead of its own array value.

score 11 · Accepted Answer · answered Feb 16 '18 at 16:35

11

Just use a capture group in regex:

var str = "123/12*312+4-2";
var arr = str.split(/(\D)/);

console.log(arr)

\D is same as [^\d] (anything but digits)

answered Feb 16 '18 at 16:35

anubhava

This adds the separator as another value in the array and doesn't keep it in the first value – Alexandre Elshobokshy Jan 18 '19 at 15:43
Please check OP's expected output, that is what OP wanted. – anubhava Jan 18 '19 at 15:46
1

Could you kindly add an extension for this issue? For future reference on google for people like me :-) – Alexandre Elshobokshy Jan 18 '19 at 15:46
1

Use `var arr = str.match(/\d+(?:\D+|$)/g);` – anubhava Jan 18 '19 at 15:48

score 1 · Answer 2 · answered Feb 16 '18 at 16:36

1

console.log(
  "123/12*312+4-2".match(/\d+|\D/g)
)

In regex, \d+ for number combination and \D for non digit.

answered Feb 16 '18 at 16:36

Pranav C Balan

2 Answers2