htaccess: Redirection rules

ht_redirect.txt

RewriteEngine On
RewriteBase /

### Redirect www to non-www ###
RewriteCond %{HTTP_HOST} ^www.yourdomain.com [NC]
RewriteRule ^(.*)$ http://yourdomain.com/$1 [L,R=301]

### Redirect non-www to www ###
RewriteCond %{HTTP_HOST} ^yourdomain.com [NC]
RewriteRule ^(.*)$ http://www.yourdomain.com/$1 [L,R=301]

### Redirect old non-www to new non-www ###
RewriteCond %{HTTP_HOST} !newdomain.com$ [NC]
RewriteRule ^(.*)$ http://newdomain.com/$1 [L,R=301]

### Redirect old www to new www ###
RewriteCond %{HTTP_HOST} !newdomain.com$ [NC]
RewriteRule ^(.*)$ http://www.newdomain.com/$1 [L,R=301]

### Simple page redirect ###
RewriteCond %{QUERY_STRING}  ^$
RewriteRule ^page_one\.html$ /page_tow.html? [R=301,NE,NC,L]