Since you didn't show any input data, and you didn't elaborate on "I cant get grep to work", I can only guess at a couple of likely problems.

You might need to chomp your input:

chomp(@raw_data, @fileb);
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You might need to use quotemeta on your regex:

$testit = quotemeta $_;
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Misc advice:

• "code" tags are nice: Writeup Formatting Tips
• use strict and warnings