Javascript - splitting string with use of regex

Question

Maybe there is solution righ in front of my nose but i cant see it.

var expr = "-5+6.3x24";
console.log(expr.split(/([+\-x\/])/));

Output is logically:

["", "-", "5", "+", "6.3", "x", "24"]

But what i need is following:

["-5", "+", "6.3", "x", "24"]

I need to split this string by separators +,-,x,/, but not when is the separator at the beginning of string. Any ideas how to edit this code? Thanks alot.

expr.match(/-?\d+(?:\.\d+)?|\S/g)

Thomas
– Thomas

2016-07-17 17:09:26 +00:00
Commented Jul 17, 2016 at 17:09 — Thomas
– Thomas, Commented Jul 17, 2016 at 17:09

ABE · Accepted Answer · 2016-07-17 16:56:24Z

3

var expr = "-5+6.3x24";
console.log(expr.split(/(?!^)([+\-x\/])/));

answered Jul 17, 2016 at 16:56

ABE

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3 Comments

Mikey Over a year ago

This solution will produce the appropriate result for that specific example. However, it will probably give an undesired result for other examples like "5x-5" that gives ["-5", "x", "", "-", "5"].

ABE Over a year ago

True, but there is no reason to have such syntax, this is not a valid mathematical syntax.

Jindrich Kovalcik Over a year ago

Thank you very much. It is working marvelously. Example like "5x-5" is in my case evaluated like err.

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