ACL regex and attribute value

Helo

Is the kind of ACL below supported?
access to dn.regex="^uid=.+,(ou=.+),o=org$" attrs=foo val.regex="^(.*)$"
  by ...

I expect $1 to hold ou=whatever and $2 to hold attribute foo value that
gets modified. I have trouble to get it working, and I wonder if
1) are $<digit> supported in val.regex ?
2) is it allowed touse $<digit> with multiples regex? Ot will the values
gathered by the last match overwrite the first one?

--

-- 
Emmanuel Dreyfus
manu <at> netbsd.org