As far as sb/sth is concerned: ‘As far as my parents are concerned, I’m free to come whenever I like.’ ‘As far as the law is concerned, you are innocent until proven guilty.’
Be concerned about sth (Something or someone that causes anxiety; a source of unhappiness): ‘Poverty is a constant concern for the government.’ ‘He is concerned about the recent spate of injuries.’
A feeling of sympathy for someone or something: ‘She showed her concern for the flood victims.’