The first thing you could do is add the strictures:

use warnings;
use strict;
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This will issue the following useful complaint, notifying you that $file was not assigned a value:

Global symbol "$file" requires explicit package name at script line 17
+.
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Secondly, your input data does not contain the string "REGULATION ALERTS". When I run your script, I get nothing printed to the output because this string was never found.