can't use GRegexp if we need to support centos5 ... vipsthumbnail was using it to parse geometry strings new geo parser, plus some tests see https://github.com/jcupitt/libvips/issues/622
can't use GRegexp if we need to support centos5 ... vipsthumbnail was using it to parse geometry strings new geo parser, plus some tests see https://github.com/jcupitt/libvips/issues/622