Hi,

I would suggest to avoid using reserved keywords like string, gr, gs etc in server side scripts.

Also put try catch to know/handle exceptions.

(function executeRule(current, previous /*null when async*/ ) {

//incident description is {"Impact":"SERVICES",<a target=\"_blank\" href=\"http://www.google.com\">Open in Browser</a></p>","ProblemID":"P-1234"}
try{
var desc= current.description.toString();
gs.info('Descriptin is : '+desc);
	if (desc.indexOf('{"Impact":"SERVICES"') > -1) {
 	var body = desc.split('href=\"'); //find to spilt
 	body = body[1].split('\">Open'); //end split
        body = body[0].toString(); // This is the string

    gs.log(body, 'test');

}catch(e){
gs.error('Exception in BR : '+e);
}

})(current, previous);

Also put more logs and see what values you are getting.

Thanks,
Anil Lande