用于查询字符串重定向的 htaccess 重写规则？

Question

My htaccess block of code in wordpress works fine but I can't understand the syntax despite knowing what it does.

 RewriteCond %{QUERY_STRING} "mobileSite=" [NC] RewriteRule (.*) /$1? [R=301,L]

For example a url as follows

www.example.com/?mobileSite=1

will be redirected to

www.example.com

The code works fine but I cant understand the actual syntax part. For example what does (.*) /$1? [R=301,L] (.*) /$1? [R=301,L] do?

There number after mobileSite is a variable between 0 and 1 but it is not included in RewriteCond %{QUERY_STRING} "mobileSite=" [NC] despite the code actually working.

Please explain to me the syntax?

Thanks

Answer 1

If you want to match only 0 or 1 in query parameter then use:

RewriteCond %{QUERY_STRING} ^mobileSite=[01]$ [NC]
RewriteRule (.*) /$1? [R=301,L]

RewriteRule Breakup:

(.*)  # match anything in URI and group it in captured group #1
/$1   # $1 is back-reference of captured value in (.*)
R=301 # redirect with status 301
L     # Last rule
?     # ? in the end is for stripping any previous query string

RewriteCond Breakup:

%{QUERY_STRING} # match from query string
^               # start
mobileSite=[01] # match mobileSite=0 or mobileSite=1
$               # end
[NC]            # flag for ignore case

References:

• Apache mod_rewrite Introduction
• Apache mod_rewrite Technical Details
• Apache mod_rewrite In-Depth Details
• .htaccess tips and tricks