How to ensure a word has been removed from repository?

Hi all,

I just completed a series of filter-branch commands to remove a couple
of sensitive words from a repository before I publish it. The words
were found in commit messages, directory names, file contents, and
various other places (kind of weird, I know). I believe I have removed
them all, but I would like to double check but don't know how.

Given that much of the repository is stored in compressed packs, I
can't just use grep to look for the words. To get around this, I've
unpacked the objects, use a Perl script (filtinf example script) to
decompress them and then use grep (this has proven to be quite slow).

Is that going to find every possible occurrence if all the relevant
files are plain text?

Is there an easier way to search the repository? The way I'm doing it
has required some awfully deep knowledge to expire and prune
everything. I feel like I must be missing something.

Thanks,
Patrick