force www in htaccess except all subdomains

Question

my force www htaccess code is :

RewriteEngine On
RewriteCond %{HTTP_HOST} !^www\.
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]

but i have problems with subdomains ex:

abcdef.example.com  ====> www.abcdef.example.com

and i want to edit code to be worked like these:

example.com         ===> www.example.com
abcdefg.example.com ===> abcdefg.example.com
example.co.uk       ===> www.example.co.uk
abcd.example.co.uk  ===> abcd.example.co.uk

possible duplicate of [Generic htaccess redirect www to non-www](http://stackoverflow.com/questions/234723/generic-htaccess-redirect-www-to-non-www) — Wahyu Kristianto, Dec 17 '13 at 10:47

Jon · Accepted Answer · 2013-12-17T10:17:16.217

5

RewriteEngine On
RewriteCond %{HTTP_HOST} ^example\.(co\.uk|com)
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]

Or more generic:

RewriteEngine On
RewriteCond %{HTTP_HOST} ^[0-9a-zA-Z-]+\.[a-zA-Z]{2,}$
RewriteRule ^(.*)$ http://www.%{HTTP_HOST}/$1 [R=301,L]

edited Dec 17 '13 at 10:17

answered Dec 17 '13 at 10:10

Jon

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does not work on Apache 2.4, it results in: `www.sub.domain.com` – Jan 16 '18 at 15:57

force www in htaccess except all subdomains

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