Server 500 error - moved app in subfolder - php

Question

I developed an application in a subfolder of my website and it worked fine.
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond $1 !^(index\.php|images|swf|uploads|js|css|robots\.txt)
RewriteRule ^(.*)$ /app/index.php/$1 [L]
</IfModule>
This file was working fine so and index.php was not required to navigate within the application. Now I moved the application to root of website and changes the last line to
RewriteRule ^(.*)$ index.php/$1 [L]
Now I have start getting Internal Server Error 500. I am not sure that it is something I have done or the .htacces is required to be configured differently. It might be an issue with host too, but I want to exhaust my options first.
Any help will be appreciated. Thanks in advance.

Answer 1

if you in root of hosting you just need
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond $1 !^(index\.php|images|swf|uploads|js|css|robots\.txt)
RewriteRule ^(.*)$ /index.php/$1 [L]
</IfModule>
if you site in folder /foo you need:
<IfModule mod_rewrite.c>
RewriteEngine on
RewriteBase /foo
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteCond $1 !^(index\.php|images|swf|uploads|js|css|robots\.txt)
RewriteRule ^(.*)$ /foo/index.php/$1 [L]
</IfModule>
if still not working try this, for me it works all over:
RewriteEngine On
RewriteBase /foo
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(.*)$ /foo/index.php/$1 [L]