Learning perl in a week?

I want to implement some text similarity algorithms in perl, I have never used perl in the past, I have coded in C++ but not an expert, I just have 7 days to finish this, what are some of the key areas I should be touching in perl, can someone recommend me some tutorials/books to refer in perl (to learn in 7 days), any specific pointers for learning regular expressions?

Learning perl in a week?
A search for "PERL +tutorial" got about 29,700,000 results, the most probable starting point from the first page being the URL below. Good luck.