If you want to concatenate RewriteCond with logical AND it is enough to put them one under the other view:
– Convert url to lower case using Apache HTTP
If you want to concatenate them with a logical OR then we must use the [OR] operator. For example, if we have the domains:
-flossblog.ca
-flossblog.co.uk
-flossblog.com
-flossblog.es
-flossblog.de
and we want to redirect the domains flossblog.ca and we would flossblog.co.uk to flossblog.com in the following way:
RewriteCond % {%{HTTP_HOST} flossblog.ca$ [OR]
RewriteCond % {%{HTTP_HOST} flossblog.co.uk$
RewriteRule ^ /(.*) $ http://www.flossblog.com/$ 1 [L,NE,NC]