ToExpression
 Usage
• ToExpression[input] gives the expression obtained by interpreting strings or boxes as Mathematica input.
• ToExpression[input, form] uses interpretation rules corresponding to the specified form.
• ToExpression[input, form, h] wraps the head h around the expression produced before evaluating it.
Notes
• Example: ToExpression["1 + 1"]  . • ToExpression["string"] uses InputForm interpretation rules. • ToExpression[boxes] uses StandardForm interpretation rules. • ToExpression prints a message and returns $Failed if it finds a syntax error. ToExpression does not call $SyntaxHandler. • The input given in ToExpression can correspond to multiple Mathematica expressions. ToExpression processes each one in turn, just like Get. • ToExpression[input, form, Hold] can be used to convert input to an expression, but with the expression wrapped in Hold to prevent evaluation. • ToExpression uses any relevant definitions given for MakeExpression. • New in Version 1; modified in 5.1.
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