RewriteEngine On
RewriteCond %{HTTP_HOST} ^www.pacline.com$
RewriteRule ^blog/(.*)$ http://blog.pacline.com/$1 [L,R=301]

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

Redirect 301 /blog/example-post http://blog.example.com/example-post

Redirect permanent /blog http://blog.example.com/

RewriteEngine on

RewriteCond %{HTTP_HOST} ^(www.)?example.com$
RewriteRule ^blog/(.*)$ http://blog.example.com/$1 [L,QSA,R=301]

RewriteCond %{HTTP_HOST} ^blog.example.com$
RewriteCond %{REQUEST_URI} !^blog/
RewriteRule ^(.*)$ /blog/$1 [L,QSA]