Still easy to filter for the F word hidden in first letters, start by looking for sentences that start with an F. Helps reduce compute vs having the filter check every combination for you. Increaded productivity, you can code a filter for that in a sec. This will work for sure, no one will think of a path around because it would be too whack.
Faster that you could finish the code for the F word at the beginning of sentences I just snuck another F bomb and a new profanity in.