Why should the output be AUDI and McLAREN when the input is Audi and McLaren?

Why should FORD be removed from the list?

Also, you can help us to provide better answers by showing us the code you have already written for this task. Please also tell us what it does and where it fails to do what you need.

%hash=( audi => AUDI, ...);
print $hash{ lc($input) };
[download]

Please see Re: Pattern matching, a reply to your annonymous repeat of this question, for suggestions on improving your questions.

G'day Nansh,

Welcome to the Monastery.

As already pointed out by others, this is a poorly presented question. Without knowing what regex you've used, or what output your current code produces, it's impossible to say, with any certainty, why you're not getting the output you want. Please read "How do I post a question effectively?" before posting again.

As a complete guess, given you need parentheses to capture text that, itself, includes parentheses, you may not have escaped parentheses correctly (see perlre):

$ perl -E 'say +("X(a,b,c)" =~ /X(\([^)]+\))/)[0]'
(a,b,c)
[download]

Also consider stepping through your matching code with Regexp::Debugger.