I want to redirect to different domain, 83answers.com if url contains forum string.
Like if my url is test.guru99.com/forum/xyxyxzz<
For the base URL, you don't need RewriteCond, just RewriteRule:
RewriteRule forum http://83answers.com [R,L]
For the query string, you were almost there:
RewriteCond %{QUERY_STRING} forum
RewriteRule .? http://83answers.com [R,L]
The combined rules:
RewriteRule forum http://83answers.com [R,L]
RewriteCond %{QUERY_STRING} forum
RewriteRule .? http://83answers.com [R,L]
Note that you must include http://. If you just use 83answers.com, the server tries to redirect to a URL on your server. For example, it would redirect http://test.guru99.com/forum/xyxyxzz to http://test.guru99.com/83answers.com, which is no good.
Real answer that i maded code is
RewriteRule ^(.*)string(.*)$ http://your.website.com [R=301,L]
in place of string yoou can put your word
You can add an OR clause between two RewriteCond like this:
RewriteCond %{QUERY_STRING} forum [OR]
RewriteCond %{REQUEST_URI} forum
RewriteRule ^ http://83answers.com/? [L,R=301]