RewriteMap blogs txt:/var/www/redirect/conf/blogs.map
RewriteMap lowercase int:tolower

RewriteCond   ${blogs:${lowercase:%{HTTP_HOST}%{HTTP_URI}%{QUERY_STRING}}}  (.+)
RewriteRule   (.*) http://%1 [R,NE,L]
#
RewriteCond   ${blogs:${lowercase:%{HTTP_HOST}%{HTTP_URI}}}  (.+)
RewriteRule   (.*) http://%1 [R,NE,L]

RewriteCond   ${blogs:${lowercase:%{HTTP_HOST}}}  (.+)
RewriteRule   (.*) http://%1 [R,NE,L]