Who is the master to help the younger brother I send a. htaccess domain name to the file? Why not this one?

Who's going to send me a. htaccess domain name to file? Why can't this be?
Rewriteengine on
Rewritecond%{http_host} ^www.xxx.com$ [Or]rewritecond%{http_host} ^xxx.com$
Rewriterule ^/?$ "http\:\/\/www\.example\.com" [r=301,l]

Who's going to send me a. htaccess domain name to file? Why can't this be?

At the same time, there are five domain name 1.www.example.com,2.www.xxx.com,3.xxx.com,4.bbs.example.com;5.news.example.com in a space.
Features to implement:
When accessed with www.xxx.com,xxx.com, automatically jumps to www.example.com (the Address bar domain name appears as www.example.com) to the Space main page index.php.
When bbs.example.com comes to visit, point to Www.example.com/bbs Sub-page; (Address bar domain name is displayed as Bbs.example.com).
When news.example.com comes to visit, point to www.example.com/news Sub-page; (Address bar domain name is displayed as News.example.com).



------Solution--------------------
Domain jump has not been tried ... Did you not turn on the. htaccess directory identification?
Sub-page Jump words can use this
Rewritecond%{http_host} ^bbs.example.com$
Rewritecond%{request_uri}!^/bbs/
Rewritecond%{request_filename}!-f
Rewritecond%{request_filename}!-d
Rewriterule ^ (. *) $/bbs/$1
Rewritecond%{http_host} ^bbs.example.com$
Rewriterule ^ (/)? $bbs/index.php [L]
------Solution--------------------
Domain turn? Is it just a jump?

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