使用split（）方法分割字符串

Question

I am trying to split a string into array but the regex I am using doesn't seem to work

My code

<script type="text/javascript">
    function GetURLParameter(sParam) 
    {
        var sPageURL = window.location.search.substring(1);
        var sURLVariables = sPageURL.split('&');
        for (var i = 0; i < sURLVariables.length; i++)
        {
            var sParameterName = sURLVariables[i].split('=');
            if (sParameterName[0] == sParam)
            {
                return sParameterName[1];
            }
        }
    }
    </script>
<script type="text/javascript">
        $(document).ready(function(){
        var product= GetURLParameter("name");
        var producttype=GetURLParameter("type");
        var prod = product.replace(/%20/g," ");
        var productname = prod.split('\\s+(?=\\d+M[LG])');
        alert(productname[0]);
        });
    </script>

My Input String is " Calpol Plus 200MG "

Expected output is array[0] = "Calpol Plus" and array[1] = "200MG"

The regex I am using is \\\\s+(?=\\\\d+M[LG])

Answer 1

You passed your regex as a string, see?

var productname = prod.split('\\s+(?=\\d+M[LG])');

You need to pass it as a regex literal:

var productname = prod.split(/\\s+(?=\\d+M[LG])/);

split() will split either by a regex, or by a substring, depending on what is passed.

Answer 2

Instead of

"Calpol Plus 200MG".split('\\s+(?=\\d+M[LG])')

You must use one of these:

• RegExp constructor to convert your string to a regular expression:

   "Calpol Plus 200MG".split(RegExp('\\\\s+(?=\\\\d+M[LG])')) 

• Directly use a regular expression literal:

   "Calpol Plus 200MG".split(/\\s+(?=\\d+M[LG])/) 

  Note in this case you don't need to scape the \\ characters with another \\ .