Question

May be it will be a very easy question some of expert but seems difficult to me. I want to use a variable in pattern of regular expression.

$("#srcbtn .btnPage").live("click",function(){
     var filter = $(this).val(), count = 0;

     $(".checkpoint").each(function () {
         if ($(this).find(".chpdetails .chkpname").text().search(new RegExp(/\b filter /i)) < 0) {
               $(this).hide();
         } else {
               $(this).show();
               count++;
         }
    });
});

but the filter variable doesn’t work in if condition. the purpose of this code is to search a word which is start with filter variable’s value i.e. A, B etc. How can i do this?

Thanks in advance.

Answer 1

Use this :

new RegExp("\\b" + filter, 'i')

See the documentation on RegExp

If you have many checkpoints, you should probably build the regexp object before entering the loop instead of building it at each iteration :

 var r = new RegExp("\\b" + filter, 'i');
 $(".checkpoint").each(function () {
     if ($(this).find(".chpdetails .chkpname").text().search(r) < 0) {
           $(this).hide();
     } else {
           $(this).show();
           count++;
     }
});