I doubt that actually is working. A few problems:

• You shouldn't ever need to use "$2". It's just the same thing as $2.
• So you're still assigning two values to the same hash key. The second one overwrites the first, so that $uniques{"$2"}++; line does nothing.
• Also, | is the bitwise or operator. You want || or or.
• And finally, running any regexp match overwrites the values of all the number variables (for instance, $2), so after checking $2 =~ /css/i, $2 will be undef.

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