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my $main_re = do {
    local $" = ')|)(?=.*?(';
    my @REs = map $_->{from}, @conversions;
    qr/^(?=.*?(@conversions)|)/;
};

  my @scan = $entry{$k} =~ $main_re;
  for my $i (0..$#scan) {
...
    $entry{$k} =~ s/$conversions[$i]{from}/$conversions[$i]{to}/g;
    conversions[$i]{count}++;
  }