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Asked: 2026-05-22T02:23:05+00:00

I’m trying to retrieve the category part this string property_id=516&category=featured-properties , so the result

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I’m trying to retrieve the category part this string “property_id=516&category=featured-properties“, so the result should be “featured-properties”, and I came up with a regular expression and tested it on this website http://gskinner.com/RegExr/, and it worked as expected, but when I added the regular expression to my javascript code, I had a “Invalid regular expression” error, can anyone tell me what is messing up this code?

Thanks!

var url = "property_id=516&category=featured-properties"
var urlRE = url.match('(?<=(category=))[a-z-]+');
alert(urlRE[0]);
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1 Answer

  1. Editorial Team

    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.

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