Limit general read-operations to svn-repo

[Stefan Bauer]

Dear Users,

We're having around 40 repositories.
I'm trying to limit write access to a specific group per repository and 
all read access to a group. How can i achieve this?

I was able to limit the write operations with:

<Location /svn/install>
  <Limit MERGE MKCOL POST PUT DELETE PATCH PROPPATCH>
    Require ldap-group CN=svn-repo-install-read
  </Limit>
</Location>


But how can i set a general Limit for all repos below /svn/ for read? 
... is not working:

<LocationMatch /svn/.*>
Require ldap-group CN=SVN_user
</LocationMatch>

I would like to have that users prompted for credentials when they try 
to read from repos below /svn and the credentials are checked if the 
user is part of SVN_user.

Thank you in advance

Stefan