htaccess redirect if URL contains a certain string

Question

How would I write a .htaccess redirect rule if the URL contains a certain word?

e.g. if it contains foobar then redirect to index.php

Answer 1

RewriteCond %{REQUEST_URI} foobar RewriteRule .* index.php 

or some variant thereof.

Answer 2

RewriteRule ^(.*)foobar(.*)$ http://www.example.com/index.php [L,R=301] 

(No space inside your website)