anchor.diff:  /// This RegExp matches mathematic representations of funktions (e.g. ´f(x)=x^2´).
   RegExp regexFunction = new RegExp(r"([a-z]+)\(([A-Za-z]+)\)\s*=\s*(.+)$");
   
  +
   List controlchars = ['(', ',', ')', ';'];
  +
   
   /// These function convert numbers between different angle units.
   double degtorad(a) {
  
positive.code: double gradtorad(a) {
    return (a / 200) * math.PI;
  }
  
negative.code: export 'mathutil.functions.dart';
  export 'mathutil.constants.dart';
  
  
  /// This RegExp matches all numbers including scientific notations.
  RegExp regexNumber   = new RegExp(r"(?:\d*\.)?\d+(?:e(?:\+|-)?\d+)?");
  /// This RegExp matches all expressions that contain no equality operator (´=´).
  