Of course, you don't want to be using a single, hardcoded file name. If someone else submits a comment at the same time, your block.txt will get overwritten, avoiding your scan. Look into File::Temp.
Updated: (repeating messaged clarification for the benefit of others) The problem isn't with the code you've shown. Suppose I click submit. Your code dumps my comment into block.txt. Before the file is read in by your scanner, someone else submits a comment. Now your scanner checks block.txt, but not MY block.txt. Depending on how the rest of your code works, my comment is either dropped (bad) or not scanned (also bad).
The intelligent reader will judge for himself. Without examining the facts fully and fairly, there is no way of knowing whether vox populi is really vox dei, or merely vox asinorum. — Cyrus H. Gordon
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