For deletion you would use this pattern, sorry: 
while (my $line = <$pattern_fh>) {
    chomp $line;
    # Use quotemeta to allow for items like A[0]
    push @tokens, quotemeta($line);
}
my $pattern = '^(?:' . join('|', @tokens) . ')[^a-zA-Z]*$';
print "Search pattern: $pattern\n";

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In reply to Re^7: Search and delete lines based on string matching by imp
in thread Search and delete lines based on string matching by Anonymous Monk

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