src/ExpressionConverter.php
public function getExpressionParts(Expression $expression)
    {
        $cleanedExpression = preg_replace('/[()*\-+\/]/', ' ', $expression->value());
        $expressionParts   = explode(' ', $cleanedExpression);

        return$expressionParts;
    }
public function getExpressionParts(Expression $expression)
    {
        $cleanedExpression = preg_replace('/[()*\-+\/]/', ' ', $expression->value());
        $expressionParts   = explode(' ', $cleanedExpression);

        return$expressionParts;
    }
@param Expression $expression

@return array