Javascript with regex

Question

I am writing a javascript code usign regex such that it validate license plate. I want a pater for my license plate is 6-8 digit that is not more than 8 and not less than 6 it would be 6 or 7 or 8. But digit should be alphanumeric so I tried function as.

<!----------LICENSE PLATE---------->
var strFilter = /^[A-Za-z0-9]$/;
var obj = document.getElementById("licenseplate");

if ((!strFilter.test(obj)) || (obj.length < 6) || (obj.length > 8)){
    alert("Please enter valid 6-8 digit license plate.");
    obj.focus();
    obj.style.background = "#DFE32D";
    obj.value = "";
    return false;
}

It gives me error on all condition that if all are numeric or all are alphabetic or are combination of both.

As I was following patter on my pages so I used it... Well Its inpage validation that may be second reason for using HTML comment. — Rahul Singh
– Rahul Singh, Commented Dec 12, 2011 at 4:44

勿绮语 · Accepted Answer · 2012-02-14 15:03:36Z

3

Something like:

/^[0-9A-Za-z]{6,8}$/

edited Feb 14, 2012 at 15:03

answered Dec 12, 2011 at 4:44

勿绮语

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2 Comments

Rahul Singh Over a year ago

12222222, 122AAA22,5566AVA or anything else Its giving me error.

勿绮语 Over a year ago

try document.getElementById("licenseplate").value

smendola · Accepted Answer · 2011-12-12 05:13:39Z

1

obj.length is not right... obj, as returned by document.getElementById() is a DOM node, not a String. Assuming licenseplate is a form field:

var strFilter = /^[0-9A-Za-z]{6,8}$/;
var obj = document.getElementById("licenseplate");
if (!strFilter.test(obj.value)) {
    alert("Please enter valid 6-8 digit license plate.");
    obj.focus();
    obj.style.background = "#DFE32D";
    obj.value = "";
    return false;
}

This works.

edited Dec 12, 2011 at 5:13

answered Dec 12, 2011 at 4:58

smendola

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