Transform math expression String without evaluation

[brucelit]

Dear Mr. Uklimaschewski,

I came across your excellent repository, and what I am looking for is a parser from Java String to math expression, like the one shown in the photo. This is a part of my thesis, which is an optimization problem for solving the value of all variables in the expression. After looking into your documentation and some examples, I could not find a solution.

In the photo, as you see, I have an Array variable x. The first expression "x0/(x0+x1+x4)" needs to be transformed into x[0]/(x[0]+x[1]+x[4]). The other String should be transformed in the same way, and I can guarantee they are all valid math expressions without any missing brackets, etc. The returned expression is a variable synthesis (type Double), which will be used as input for an optimizer, which calculates the value of x[0] to x[4].

I know you must be very busy so I appreciate any hints you can give! Thank you!