Comparing two csv files and outputting matches using Java

I have two csv files

One csv file with one column: user agent strings (10,000 count)

Another csv file with 3 columns: regex pattern, rank, and type (86 count)

I was told to create a program that would test all the user agent strings with the regex patterns and have a file that outputted two columns:

User Agents and their type based on the tests.

Is there any way to do this? I've been working at this for a week with no solution in sight.