Nice. One suggestion:
print $buffer if /$pat/;
print $buffer if /\Q$pat\E/o;
The \Q and \E presume that $pat is just a string, not a regex. So you would want to escape any special characters (like '.' or '+' ) and the o tells Perl that $pat isn't going to change in the loop, so it won't keep recompiling the pattern.
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