Wordpress migration and htaccess file - wordpress

Question

I need to migrate a wordpress from http://myoldwebsite.com/blog to http://newwebsite.com/.
I have htaccess file as follows. Am I right if I change
RewriteBase /blog/ to RewriteBase /
RewriteRule . /blog/index.php to RewriteRule . /index.php
My .htaccess code.
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /blog/
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /blog/index.php [L]
</IfModule>
# END WordPress

Answer 1

Just use a migration plugin, like WP Migrate, to export the DB.
After you are done with the DB import, don't forget to go to Settings->Permalinks and just hit save button, in order to have .htaccess updated.
Done.

Answer 2

Unfortunately it's not as simple as just changing the .htaccess file.
From the Wordpress codex:
When your domain name or URLs change - i.e. from
http://example.com/site to http://example.com, or http://example.com
to http://example.net - there are additional concerns. The files and
database can be moved, however references to the old domain name or
location will remain in the database, and that can cause issues with
links or theme display.
The most important change which most trips up a lot of people is to change "siteurl" and "home" in the "wp_options" table to point to your new address.

Answer 3

Yes you can add the following to htaccess file. If you are migrate a wordpress from http://myoldwebsite.com/blog to http://myoldwebsite.com/
# 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
Note You have to change URL in database also.
If you want to migrate a wordpress from http://myoldwebsite.com/blog to http://newwebsite.com/. You can use followin plugin to migrate
Plugin link