Regex match for IDN domain names

Question

I want to check the domains with regex. I used this code but it doesn't work:

/^([^\s<>]+([^\s<>]*[^\s<>]+)?.){0,}([^\s<>]+([^\s<>]*[^\s<>]+)?){1,63}(.[^\s<>]{2,7})+$/i

My domain format is:

• example.com

I don't want:

• www.example.com
• http://example.com
• http://www.example.com

At the same time, user can add the domains;

• with 2 extension like example.co.uk
• as an IDN like üüüüüü.üüü