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Thread: Split equation and retain numbers and operators. Possible?

  1. #1
    Join Date
    Dec 2005
    Location
    TX
    Posts
    7,931

    Question Split equation and retain numbers and operators. Possible?

    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')+'\n\n'+tarrO.join('\n'));
    </script>
    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
    
    +
    -

  2. #2
    Join Date
    Mar 2011
    Posts
    1,252
    Try:
    Code:
    var tarrO = strIn.match(/\d+|\+|\-|\*|\//g);
    Rick Trethewey
    Rainbo Design

  3. #3
    Join Date
    Feb 2006
    Posts
    2,930
    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, '$1\n')+ '\n\n',
        tarrO;
        try{
            tarrO= eval(strIn);
        }
        catch(er){
            tarrO= 'Bad Data!';
        }
        return tarrN+tarrO;
    }
    alert(calc('123+456-321'));

  4. #4
    Join Date
    Jul 2008
    Location
    urbana, il
    Posts
    2,787
    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"]
    you can join it yourself.
    Create, Share, and Debug HTML pages and snippets with a cool new web app I helped create: pagedemos.com

  5. #5
    Join Date
    Dec 2005
    Location
    TX
    Posts
    7,931

    Thumbs up

    Quote Originally Posted by rtrethewey View Post
    Try:
    Code:
    var tarrO = strIn.match(/\d+|\+|\-|\*|\//g);
    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.
    Last edited by JMRKER; 03-14-2013 at 03:25 PM. Reason: Tried secondary code suggestion

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