Invalid regular expression error

Question

I\'m trying to retrieve the category part this string \"property_id=516&category=featured-properties\", so the result should be \"featured-properties\

Answer 1

  var url = "property_id=516&category=featured-properties",

  urlRE = url.match(/(category=)([a-z-]+)/i); //don't forget i if you want to match also uppercase letters in category "property_id=516&category=Featured-Properties"
  //urlRE = url.match(/(?<=(category=))[a-z-]+/i); //this is a mess

  alert(urlRE[2]);