Note that although all of the regular expression does not show in the gray box below that selecting and copying it will capture all of the relevant text.
// Note all the backslashes for escaping the proper characters.
// The whole part to get this value out is below.
var searchString =
new RegExp("div id\=\"zk\-comp\-[0-9]+\" class\=\"panels first\-set\"\>\<div id\=\"zk\-comp\-[0-9]+\" class\=\"es\-tab\-panel\"\>\<div id\=\"zk\-comp\-[0-9]+\" class\=\"es\-scrollable\-tall\"\>");
var leftIndex = "div id=\"";
var rightIndex = "\"";
var zk157 = null;
if(false != searchString.test(origText))
{
var result = searchString.exec(origText);
zk157= new String(result);
$context.result.postMessage($context.result.LEVEL_INFO, "First Filter: "+ zk157);
zk157=zk157.substring(zk157.indexOf(leftIndex) + leftIndex.length);
$context.result.postMessage($context.result.LEVEL_INFO, "Second Filter: "+ zk157);
zk157=zk157.substring(0, zk157.indexOf(rightIndex));
$context.result.postMessage($context.result.LEVEL_INFO, "zk157= " +zk157);
}