Apache .htaccess mod_rewrite and clean urls

<IfModule mod_rewrite.c>
  RewriteEngine On

  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteCond %{REQUEST_URI} ^/domain1.com/(.*)$
  RewriteRule ^(.*)$ /domain1.com/index.php?q=$1 [L,QSA]

  RewriteCond %{REQUEST_FILENAME} !-f
  RewriteCond %{REQUEST_FILENAME} !-d
  RewriteCond %{REQUEST_URI} ^/domain2.com/(.*)$
  RewriteRule ^(.*)$ /domain2.com/index.php?q=$1 [L,QSA]
</IfModule>

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^/domain1.com/(.*)$ /domain1.com/index.php?q=$1 [L,QSA]
#                     ^ should be escaped