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

Positive lookbehinds (your ?<=) are not supported in JavaScript environments that do not comply with ECMAScript 2018 standard, which is causing your RegEx to fail.

You can mimic them in a whole bunch of different ways, but this might be a simpler RegEx to get the job done for you:

var url = "property_id=516&category=featured-properties"
var urlRE = url.match(/category=([^&]+)/);
// urlRE => ["category=featured-properties","featured-properties"]
// urlRE[1] => "featured-properties"

That's a super-simple example, but searching StackOverflow for a RegEx pattern to parse URL parameters will turn up more robust examples if you need them.