More Regexp help

[Freeman Gilmore]

 

I have a string of accidentals and I want the sum of their deviation. 

If I have the string, “a bx3 cd -jk -DRx2 rtyu -HJK 31 17x4 -7 -41x3” with all possible examples.

I want to convert it to,  “ a (* b 3) -jk (* -DR 2) rtyu -HJK n31  (* n17 4) -n7 (* -n41 3)”

Then,  (a (* b 3) -jk (* -DR 2) rtyu -HJK n31  (* n17 4) -n7 (* -n41 3)) .    ( + will be applied to this)

1] Where  “a” “cd” “-jk” “rtyu” “-HJK” are unchanged.    (variables)

2] Numbers “31” “17x4” “-7” “-41x3” have “n” prefixed to them like, “n31” “n17x4” “-n7” “-n41x3”. (numbers converted to variables)

3] And “bx3” “-DRx2” “17x4” “-41x3” become “(* b 3)” “(* -DR 2)” “(* n17 4)” “(* -n41 3)”.  (number of times variables are used)

This is way beyond my capability, and I would appreciate help with this.   For my simple mind it would teach me more if this were done in say 3 steps rather than mapped.

Thank you,