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>

• Mike Cheel: What is your question?
• adeneo: You probably want a regular expression, those generally start and end with /
• adeneo: jsfiddle.net/9k9v09ds
• Timmerz: I would look for a calculator parser such as...jorendorff.github.io/calc/docs/calculator-parser.html
• jdphenix: Do you need something that handles other operators, like ^, named variables like in the expression 2x + 3 = 0, or non-integers like 2.3?

Answer 1

You do a:

str.split(/\d+/)

to get the symbols and

str.split(/\D+/)

to get the numbers

Answer 2

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>