Hrm, on number 8 "Four" using:

    (.)(.*\1){3,}

I got all but the "do not match" for "Ternstroemiaceae"

The challenge appeared to be to match words with four instances of the same letter. "Ternstroemiaceae" contains four 'e's, and thus should be in the "match" column, instead of the "don't match" column, no? Did I miss something?