: Case-specific mod rewrite on WordPress subdomain multisite I have split a WordPress blog into multiple category-specific blogs using subdomains, as the topics in the original blog were too broad

@Michele947

Wow, that's a pretty complicated answer. This is how I would do it in an .htaccess context:

RewriteEngine On
RewriteBase /

RewriteCond %{HTTP_HOST} =example.com [NC,OR]
RewriteCond %{HTTP_HOST} =www.example.com [NC]
RewriteRule ^(auto|foo|bar)/(.*)$ .example.com// [NS,L,R=301]


The RewriteConds ensure that this rule is only applied for example.com and example.com, not for any other sites. You can remove the first RewriteCond if you only want the rule to apply to example.com.
The RewriteRule then redirects e.g. example.com/auto/mercedes to auto.example.com/auto/mercedes. (If you want it to redirect to just auto.example.com/mercedes, replace / with just .) The example also does the same for the categories foo and bar; you can add as many categories as you wish just by editing the regexp.

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@Fox8124981

In ten lines you've got not only what you asked for, but a huge benefit: when you'll want you add a subject e.g "newsubject", just add a line in your map file:

newsubject newsubject


recreate the hash file, restart the server and here you go!!



So here's the "compressed" version:

RewriteMap mapsubdomains
dbm:/web/htdocs/mysite/rewriterules/mapsubdomains.map
RewriteCond %{HTTP_HOST} (([a-zA-Z0-9-]+).)([a-zA-Z0-9-]+).com$
RewriteRule (.*) - [QSA,E=PART1:${mapsubdomains:%1|notfound}]
RewriteCond %{ENV:PART1} ^$ [OR]
RewriteCond %{ENV:PART1} notfound
RewriteRule ^/([a-zA-Z]+)/(.*)$ - [QSA,E=SUBJECT:${mapsubdomains:%1|notfound}]
RewriteCond %{ENV:SUBJECT} !^$
RewriteCond %{ENV:SUBJECT} !(notfound)
RewriteRule ^/([a-zA-Z]+)/(.*)$ %{ENV:SUBJECT}.mysite.com/ [QSA,L]




Detailed answer:

(1) use a map file where you'll write simple stuff like this:

auto auto
moto moto


then include it in your rewrite rule:

RewriteMap mapsubdomains
dbm:/web/htdocs/mysite/rewriterules/mapsubdomains.map


then make a generic rule:

RewriteCond %{HTTP_HOST} (([a-zA-Z0-9-]+).)([a-zA-Z0-9-]+).com$
RewriteRule (.*) - [QSA,E=PART1:${mapsubdomains:%1|notfound}]


The previous rule means: if the hosts has two parts (e.g. part1.part2.com) then look in the mapsubdomain and fill it with the right value or "notfound" if not found.

Then if "notfound" this means you can check for the URL:

# if PART1 empty:
RewriteCond %{ENV:PART1} ^$ [OR]
# ...or PART1 not found:
RewriteCond %{ENV:PART1} notfound
# ...then lookup:
RewriteRule ^/([a-zA-Z]+)/(.*)$ - [QSA,E=SUBJECT:${mapsubdomains:%1|notfound}]

# if subject not empty, and is found then redirect:
RewriteCond %{ENV:SUBJECT} !^$
RewriteCond %{ENV:SUBJECT} !(notfound)
RewriteRule ^/([a-zA-Z]+)/(.*)$ %{ENV:SUBJECT}.mysite.com/ [QSA,L]

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