Convert a string with mathematical expressions into a float

Question

A text field contains mathematical expressions like: 12+45-6 Is possible to convert this string to a number?

Can we use the predicate facility?

Answer 1

You need to parse this input using a parser then evaluate it. I have heard of people having success using muParser for this, to save you writing it all yourself. Check it out. http://muparser.sourceforge.net/