var videoid = url.match(/(?:https?:\/{2})?(?:w{3}\.)?instagram(?:be)?\.(?:com|be)(?:\/p\/|\/)([^\s&]+)/);

assume that the network address is

https://www.instagram.com/p/xxx/?utm_source=ig_web_button_share_sheet

the above rule table can be fetched

xxx/?utm_source=ig_web_button_share_sheet

but how to write: all I have to do is fetch xxx ? There is no need for

xxx