How can i list bindings i ve to pass to script engine?

I take a script from user , for example "a+23 *b -2" . How can i list which variables used in script , for the script on left result must be {a,b}. I ve been searching whole day but couldnt find an answer yet,
ty for help.

user486070 wrote:
in this case variable "c" is missing , and engine throws "MissingReferenceException : reference for c is missing", but its not a user friendly message.
I want to give to user an input , Unknown Variable : c , plz enter value for c | ....... | <OK> etc.If you don't like the error messages the parser produces, and there isn't any way to configure them, then I think your only recourse is to write your own parser.

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