I have a mixed array that I need to sort by alphabet and then by digit

[A1, A10, A11, A12, A2, A3, A4, B10, B2, F1, F12, F3]

How do I sort it to be:

[A1, A2, A3, A4, A10, A11, A12, B2, B10, F1, F3, F12]

I have tried 

arr.sort(function(a,b) {return a - b});

but that only sorts it alphabetically. Can this be done with either straight JavaScript or jQuery?

javascript jquery arrays sorting
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