URL重写规则调整需求：添加域名格式主题名称参数

Hey there! Let's work through your rewrite rule issue and get it sorted properly.

First, let's address the immediate problem with your initial proposed rule:

RewriteRule ^topic/([^/]+)$ index.php?page=topic&server_id=$1&name=$2

This won't work because you only have one capture group (([^/]+)), so $2 will be empty. You need to adjust the regex to capture two separate values (the topic name and ID) from the URL path.

Good news about domain-formatted names #

Your concern about matching names like example.com is totally valid, but the [^/]+ pattern works perfectly here! That regex matches any character except a forward slash, which includes dots (.), hyphens, and all other characters in a domain name. No issues there.

The Correct RewriteRule Setup #

Since you need to pass two parameters in the order topic name first, ID second, your URL structure should look like this:
/topic/your-domain-name.com/123

To capture both values, use a regex with two capture groups separated by a slash:

RewriteRule ^topic/([^/]+)/([^/]+)$ index.php?page=topic&name=$1&server_id=$2

• ([^/]+) captures the topic name (e.g., your-domain-name.com) into $1
• The second ([^/]+) captures the ID (e.g., 123) into $2
• We map these to the name and server_id parameters as needed

Optional: Restrict ID to Numbers (If Applicable) #

If your server_id is always a numeric value, you can make the regex more precise to avoid unintended matches:

RewriteRule ^topic/([^/]+)/(\d+)$ index.php?page=topic&name=$1&server_id=$2

(\d+) only matches one or more digits, which adds a layer of validation.

Important Notes #

• Make sure your Apache config has mod_rewrite enabled and that you have RewriteEngine On at the top of your .htaccess or config file.
• If you absolutely can't use a slash to separate the two parameters (not recommended, since domains contain dots), you'd need a different separator that doesn't appear in either the name or ID—but using slashes is the cleanest, most standard approach for URL path segments.

内容的提问来源于stack exchange，提问作者Marcelino Pietero