This is great, but it doesn't recognize key names in lowercase. The first thing I typed was the example, but I didn't capitalize the 'C' and nothing appeared for 'cm7b5'
I wouldn't expect it to work with lowercase...if the flat indicator is 'b', it'd be a little tricky to parse something like "c9/bb". (And by "tricky to parse", I mean for both humans and computers.)
Edit: And, while we're at it, some jazz charts use "M" to indicate major and "m" to indicate minor, so your example is ambiguous.
Edit: And, while we're at it, some jazz charts use "M" to indicate major and "m" to indicate minor, so your example is ambiguous.