This challenge, also suggested by /u/a-t-k (as was last weeks), is to match musical chord names such as Cmin, Bmaj. You should match both the long and short forms, and you can find an explanation of the different chords here (the examples section is probably the quickest to understand). For this challenge, we will assume that E♯, B♯, F♭ and C♭ don't exist. We will also only be matching sixth and seventh chords.
Note that the sharp sign: ♯ is not a hash sign: #.