Matches a valid URL with or without "www".
Contributed by @itsbrunodev
^(?P<protocol>https?):\/\/(?P<domain>[a-zA-Z0-9.-]+)(?::(?P<port>\d+))?(?P<path>\/[^\s]*)?$# Valid URLs
https://example.com
https://www.example.com
http://example.com
https://www.example.com
https://example.com/path
https://www.example.com/path
https://www.example.com/path?q=query&s=anotherquery
# Invalid URLs
example.com
www.example.com
ftp://example.com