Well I have no problems with regexps... > (CentOS 3 s390 or CentOS-3 s390) should both work and you should only but this doesn't look like a regexp to me... maybe "CentOS 3[- ]s390" instead? or "(CentOS 3 s390|CentOS-3 s390)" or "CentOS( 3|-3) s390" or "\(CentOS 3 s390\|CentOS-3 s390\)" etc... Cheers, MaZe.