Array
(
)

Array
(
    [optional] => bla
)

Array
(
    [required] => haha
)

Array
(
    [required] => haha
)

Array
(
    [required] => haha
    [optional] => bla
)

Array
(
    [start_expression] => Bla
)

Array
(
    [start_expression] => Bla
)

Array
(
)