@staticmethod
def evaluate_fn_join(expression):
    """ Return the joined stuff """
    results = []
    new_values_list = []
    temp = expression.split('[')[1]
    delimiter = temp.split(',')[0].strip("'")
    values = expression.split('[')[2]
    values = values.split(']]')[0]
    values_list = values.split(', ')
    for value in values_list:
        new_values_list.append(value.strip("'"))
    result = delimiter.join(new_values_list)
    results.append(result)
    return results
