重定向非www网址到www

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我使用赫利的ISAPI重写3 ，基本上实现的.htaccess在IIS中。我需要一个非www URL重定向到www的版本，即example应该重定向到www.example。我使用的例子下面的规则，但它会影响子域：

I'm using Helicon's ISAPI Rewrite 3, which basically enables .htaccess in IIS. I need to redirect a non-www URL to the www version, i.e. example should redirect to www.example. I used the following rule from the examples but it affects subdomains:

RewriteCond %{HTTPS} (on)? RewriteCond %{HTTP:Host} ^(?!www\.)(.+)$ [NC] RewriteCond %{REQUEST_URI} (.+) RewriteRule .? http(?%1s)://www.%2%3 [R=301,L]

这适用于大多数情况，但也重定向sub.example到www.sub.example。我怎样才能把上面的规则，使子域不会被重定向？

This works for most part, but is also redirect sub.example to www.sub.example. How can I rewrite the above rule so that subdomains do not get redirected?

推荐答案

附加以下的RewriteCond：

Append the following RewriteCond:

RewriteCond %{HTTP:Host} ^[^.]+\.[a-z]{2,5}$ [NC]

这样，它只是将规则应用于nondottedsomething.uptofiveletters你可以看到，subdomain.domain将不匹配的情况，因而不会被改写。

That way it'll only apply the rule to nondottedsomething.uptofiveletters as you can see, subdomain.domain will not match the condition and thus will not be rewritten.

您可以更改[AZ] {2,5}进行更严格的TLD匹配的正则表达式，以及将所有的约束条件在域名允许的字符（如[^] +是比严格意义上更加宽容）。

You can change [a-z]{2,5} for a stricter tld matching regex, as well as placing all the constraints for allowed chars in domain names (as [^.]+ is more permissive than strictly necessary).

总之，我认为在这种情况下，将没有必要。

All in all I think in this case that wouldn't be necessary.

编辑：萨迪发现缺陷的正则表达式，更改从它的第一部分[^]至[^] +

sadie spotted a flaw on the regex, changed the first part of it from [^.] to [^.]+