private void ParseExpression(string fromExpression)
{
this.expression = fromExpression;
this.variable = parser.ExtractVariable(fromExpression);
this.coefficient = parser.ExtractCoefficient(fromExpression);
if (variable.Length > 0)
{
this.exponent = parser.ExtractExponent(fromExpression);
}
else
{
this.exponent = null;
}
}