Javascript - String split

Question

I have the following string

str = "11122+3434"

I want to split it into ["11122", "+", "3434"]. There can be following delimiters +, -, /, *

I have tried the following

strArr = str.split(/[+,-,*,/]/g)

But I get

strArr = [11122, 3434]

there can be different delimiters or there can be one at a time — Aatif Bandey, Sep 28 '16 at 04:54
you want to split only mathematical expressions or anything else? — Pankaj, Sep 28 '16 at 04:55
only one delimiter at a time. I want to split only mathematical expressions — Neeraj, Sep 28 '16 at 04:55

score 4 · Answer 1 · answered Sep 28 '16 at 04:55

Delimiters are things that separate data. So the .split() method is designed to remove delimiters since delimiters are not data so they are not important at all.

In your case, the thing between two values is also data. So it's not a delimiter, it's an operator (in fact, that's what it's called in mathematics).

For this you want to parse the data instead of splitting the data. The best thing for that is therefore regexp:

var result = str.match(/(\d+)([+,-,*,/])(\d+)/);

returns an array:

["11122+3434", "11122", "+", "3434"]

So your values would be result[1], result[2] and result[3].

score 2 · Answer 2 · answered Sep 28 '16 at 05:02

2

This should help...

str = '11122+3434+12323*56767'
strArr = str.replace(/[+,-,*,/]/g, ' $& ').split(/ /g)
console.log(strArr)

answered Sep 28 '16 at 05:02

Pranesh Ravi

18,642
9
46
70

score 1 · Answer 3 · answered Sep 28 '16 at 04:57

1

Hmm, one way is to add a space as delimiter first.

// yes,it will be better to use regex for this too
str = str.replace("+", " + ");

Then split em

strArr = str.split(" ");

and it will return your array

["11122", "+", "3434"]

answered Sep 28 '16 at 04:57

deviantxdes

469
5
17

score 1 · Answer 4 · answered Sep 28 '16 at 04:59

1

in bracket +-* need escape, so

strArr = str.split(/[\+\-\*/]/g)

answered Sep 28 '16 at 04:59

velen

164
1
4

this won't give you the symbols. – Avinash Raj Sep 28 '16 at 05:10

score 0 · Answer 5 · answered Sep 28 '16 at 05:04

var str = "11122+77-3434";

function getExpression(str) {
  var temp = str.split('');
  var part = '';
  var result = []
  for (var i = 0; i < temp.length; i++) {
    if (temp[i].match(/\d/) && part.match(/\d/g)) {
      part += temp[i];
    } else {
      result.push(part);
      part = temp[i]
    }
    if (i === temp.length - 1) { //last item
      result.push(part);
      part = '';
    }
  }
  return result;
}
console.log(getExpression(str))

Javascript - String split

5 Answers5