Cannot extract domain from co.uk

[roarnyg]

I get some bad results form co.uk and some other tlds.

echo sub.xibo.co.uk | haktldextract co.uk

echo sub.xibo.com.br| haktldextract com.br

echo sub.xibo.com.ar| haktldextract com.ar

[roarnyg]

Jamaica has same problem

echo sub.xibo.com.jm | haktldextract com.jm

[roarnyg]

It might be that com.br, com.ar and com.jm isn't regular tlds. Anyways, co.uk is.