Splitting this string in JavaScript

Question

I am trying to split the string "1 + 2 / 3 * 4 - 5 " to display "+" "/" "*" "-" to be saved into an array to, the same to be done to the number, so that I call each number and op' into a function to calculate it in BODMAS(/*+-) order.

The string can be longer and shorter as it is a user input calculation.

<p id="demo"></p>
<script>
    function myFunction() {
        var str = "1+2/3*4-5";
        var res = str.split([0-9]);
        document.getElementById("demo").innerHTML = res;
    }
</script>

You probably want a regular expression, those generally start and end with / — adeneo
– adeneo, Commented Feb 9, 2015 at 21:50
I would look for a calculator parser such as...jorendorff.github.io/calc/docs/calculator-parser.html — Timmerz
– Timmerz, Commented Feb 9, 2015 at 21:52
Do you need something that handles other operators, like ^, named variables like in the expression 2x + 3 = 0, or non-integers like 2.3? — jdphenix
– jdphenix, Commented Feb 9, 2015 at 22:19

JuniorCompressor · Accepted Answer · 2015-02-09 21:52:21Z

2

You do a:

str.split(/\d+/)

to get the symbols and

str.split(/\D+/)

to get the numbers

answered Feb 9, 2015 at 21:52

JuniorCompressor

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Comments

Peter Mortensen · Accepted Answer · 2015-03-10 21:03:18Z

0

You never called the myFunction function. Use a non-maching character at the front, [^0-9]. It will match anything that is not a number. Don't use split. split doesn't recognize [0-9] as a splitting character. Use the string.prototype.match() method instead. It will return an array containing every match.

    function myFunction() {
        var str = "1+2/3*4-5";
		var match=str.match(/[^0-9]+/g);
        
      for(i=0;i<match.length;i++){
	     document.getElementById('demo').innerHTML+=match[i]+'</br>';
	  }
    }
	myFunction();

<p id="demo"></p>

edited Mar 10, 2015 at 21:03

Peter Mortensen

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answered Feb 9, 2015 at 21:58

AL-zami

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