/((?:https?:\/\/)?(?:www\.)?instagram\.com\/(?:p|reel)\/([^/?#&]+)).*/g
List of links matches that regexp
https://www.instagram.com/p/CHeENTUjysv/
https://www.instagram.com/reel/CHeENTUjysv
http://www.instagram.com/p/CHeENTUjysv/
https://instagram.com/p/CHeENTUjysv
http://instagram.com/p/CHeENTUjysv
www.instagram.com/p/CHeENTUjysv/
instagram.com/p/CHeENTUjysv