Regex for matching a music Chord

Question

I am trying to write a function to parse the string representation of a musical chord.

Example: C major chord -> Cmaj (this is what I want to parse)

Answer 1

Change [ and ] to ( and ) in the following lines:

String accidentals = "(#|##|b|bb)";
String chords = "(maj7|maj|min7|min|sus2)";

Otherwise you're just making character classes, so [maj7|maj|min7|min|sus2] simply matches on the letter m.

I'm guessing you also want to add an ending anchor $? I see you had problems with that before, but that's probably because of the aforementioned issue.

---

Also, might you want (#|##|b|bb) to be optional (i.e., with ?: (#|##|b|bb)?)?