Police say they treating the attack as a racially motivated hate crime.
It happened in Bedford Street between 03:40 am and 04:00 am last Sunday.
The man, who is a foreign national, was taken to hospital but his injuries are not believed to be life threatening.
Police have said the attacker is in his early 30s, of slim build and around 5’11” tall.
He was wearing dark clothing and was armed with what police have said was a sharp object.
Police are appealing for witnesses to contact them on the 101 non-emergency number.