I want to break a string according to the following rules:

1. all consecutive alpha-numeric chars, plus the dot (.) must be treated as one part
2. all other consecutive chars must be treated as one part
3. consecutive combinations of 1 and 2 must be treated as different parts
4. no whitespace must be returned

For example this string:

Method(hierarchy.of.properties) = ?

Should return this array:

Array
(
    [0] => Method
    [1] => (
    [2] => hierarchy.of.properties
    [3] => )
    [4] => =
    [5] => ?
)

I was unsuccessful with preg_split(), as AFAIK it cannot treat the pattern as an element to be returned.

Any idea for a simple way to do this?