JavaScript string split by Regex results sub-strings include empty slices

Question

I\'ve the following string splitting JavaScript code:

var formula = \"(field1 + field2) * (field5 % field2) / field3\";
console.log(formula.split(/[+(-)% *\\/]/)         


        

Answer 1

Instead of splitting on /[+(-)% *\/]/ split on more than one: /[+(-)% *\/]+/. You still might get empty matches at the start and end. To solve that problem you can use a similar regex with replace:

formula.replace(/^[+(-)% *\/]+|[+(-)% *\/]+$/g, "").split(/[+(-)% *\/]+/)

So

var formula = "(field1 + field2) * (field5 % field2) / field3";
console.log(formula.replace(/^[+(-)% *\/]+|[+(-)% *\/]+$/g, "").split(/[+(-)% *\/]+/));

yields

field1,field2,field5,field2,field3