regular expressions in javascript

Hi,
I have a simple doubt in client side javascript.
I have a string "ASHDHSJDHASLJDMICROADHHASJD.TIF"
I wish to find out if the last four characters in this string
are ".TIF" This could be in any case (upper case, lower case, mixed case)
If the letters are present, I want to alert("TRUE) else alert("FALSE");

How do I use a regular expression for this particular case?

Cheers!
Abhijit

This doesn't use a RegExp but is will do the job

Code:

---

function GetExt(val){
        var str = new String(val);
        str = str.substring(str.length -4,str.length);
        return (str.toUpperCase() == '.TIF')?true:false;
}

---

http://devedge.netscape.com/library/...p.html#1193136 should help.

Thanks a lot folks.
That getExt helps me a lot. I had written something like this.

PHP Code:

---

    function matchDemo(str)
    {
        var st = new String(str);
        var re = new RegExp("(\.)(tif)","i","$");
        re.exec(st);
        if (RegExp.$1 != '')
        {
            alert(RegExp.$1);
            return true;
        }
        else
        {
            //alert('No Match Found');
            return false;
        }
    } 


---

But its not working correctly. Wondering if anyone could resolve it.

Cheers!
Abhijit

foo.tif -- Matches. The alert displays a period
foo.tif.wav -- Matches, but shouldn't
footif -- Matches, but shouldn't

Try this instead:

return /\.tif$/i.test(str)