Howdy!

I'm having some trouble coming up with a regex matching expression for a small string format:

C3#:4.
-or-
F4-:16t
-or-
E2b

These represent musical notes.

"C" is the base note (A - G, uppercase only).
"3" is the octave (1 - 6).
"#" is the accidental (optional: can be "#" sharp, "b" flat, "-" natural, or "" omitted).
":" is required if anything follows...
"4" is the duration (1 whole, 2 half, 4 quarter, 8 eighth, 16 sixteenth, 32 thirtysecond)
"." is the duration modifier (optional: can be "." dotted, "t" triplet, or "" omitted)

So the first char must be [A-G] and the second char must be [1-6]. After this it gets a little hairy. The accidental is optional, so it's possible to have the colon immediately follow the octave digit. If there is a colon, then there must be a duration digit and there cannot be a duration modifier without a duration digit.

Thanks!