[plt-scheme] Howto regexp-split string but keep delimiters

Hello all,

I need to split a large string into separate words using a regexp, but
need to keep non-whitespace delimiters:

"Ab, c, dd,hello." ==> ("Ab" "," "c" "," "dd" "," "hello" ".")

Can this be done using regexp-split? How?

Best regards,

Erich