Convert a string to expression

[Harold II]

for example, the user input a string of math expression like,
x^2+x+2

how can I convert it to a expression that VB can use to evaluate its value with given x?

[Strike]

You generally don't want to blindly evaluate arbitrary user input ...

[Harold II]

but I have to provide that function in my program, anyway.......

and in python it is really easy to do, just use
input(1+1)
and it stores 2 instead of "1+1"
. but how to do this in VB?

[manual_overide]

you have to do some string processing. this also solves the problem of executing arbitrary user input (sort of)