Question

i try to allow only number 01 (1) to 53) after / and after 2000 and over….
so i create a regex but it don’t seem to work

on this web page: http://www.regular-expressions.info/javascriptexample.html
i tried it and it work well… but when i test in on a web page

10/2010 , 23/2000

function isValidDate(value, format){
     var isValid = true;

     try{
         var inputVal = $(this).val();
         var dateWWYYYYRegex = '^(0[1-9]|[1234][0-9]|5[0-3])[-/.](20)\d\d$';

         var reg=new RegExp(dateWWYYYYRegex);

         if(!reg.test(value)){
            isValid = false;
            alert("Invalid");
         }

     }
     catch(error){
         isValid = false;
    }

    return isValid;
}

Answer 1

You have to escape backslashes if you’re going to make a regex from a string. I’d just use regex syntax, since it’s a constant anyway:

var reg = /^(0[1-9]|[1234][0-9]|5[0-3])[-/.](20)\d\d$/;

The regular expression doesn’t really make any sense, however. It’s not clear what it should be, because your description is also confusing.

edit — OK now that I see what you’re doing, that regex should work, I guess.