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Split equation and retain numbers and operators. Possible?

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Mar 14.2013

Is there a regular expression that will split a string between operands like +, -, * or /
similar to the following attempt that only partially works?

[code]
<script type=”text/javascript”>
var strIn = ‘123+456-321’;
var tarrN = strIn.split(/D/);
var tarrO = strIn.split(/+|-|*|//);
alert(tarrN.join(‘n’)+’nn’+tarrO.join(‘n’));
</script>

[/code]

Both give the same results. They split on the numbers, but loses the operators.
I was trying for an output of:

[code]
123
456
321

+
–
[/code]

to post a comment
JavaScript

4 Comments(s) ↴

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@rtretheweyMar 14.2013 — Try:
<i>
</i>var tarrO = strIn.match(/d+|+|-|*|//g);
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@mrhooMar 14.2013 — You can replace the operators with themselves followed by a newline.

[CODE]function calc(strIn){
strIn= strIn.replace(/[^.d*/+-]+/g, '');
var tarrN= strIn.replace(/([D.]+)/g, '$1n')+ 'nn',
tarrO;
try{
tarrO= eval(strIn);
}
catch(er){
tarrO= 'Bad Data!';
}
return tarrN+tarrO;
}[/CODE]
alert(calc('123+456-321'));
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@rnd_meMar 14.2013 — not the order you spec, but everything's here in this simple example (thanks to capturing parens)

[CODE]
 '123+456-321'.split(/([-+/*])/) // gives == ["123", "+", "456", "-", "321"]
[/CODE]

you can join it yourself.
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@JMRKERauthorMar 14.2013 — Try:
<i>
</i>var tarrO = strIn.match(/d+|+|-|*|//g);
[/QUOTE]

Thank you. This is closer to what I was trying for.

'mrhoo's solution uses the eval(), which in the final analysis of my feeble attempts, was what I was trying to avoid.

Thank you both. I'll report back later with progress status. ?



EDIT: Just noticed mrhoo's second post. I'll give that a try as well. Thanks again!

Tried mrhoo's solution and it works just a well for my initial needs.
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