htaccess clean url

I want to change my url to:

www.xxxx.com/en/ -> index.php?lang=en
www.xxxx.com/news -> index.php?mod=news

I use this code but it does not work:

RewriteCond %{REQUEST_URI} ^/开发者_如何学编程(pe|en|fr|sp|ar)/$ 
RewriteRule ^([^/]*)/$ index.php?lang=$1

RewriteCond %{REQUEST_URI} !^/(pe|en|fr|sp|ar)$ 
RewriteRule ^([^/]*)$ index.php?mod=$1 

var_dump($_GET) result :

array(2) { ["mod"]=> string(9) "index.php" ["PHPSESSID"]=> string(32) "e7a5fc683653b7eea47a52dfc64cd687" }

I also use htaccess tester ( http://htaccess.madewithlove.be/ ) and all things were ok! :(

Both rules pass, and are therefore applied. The first rewrites /en/ to /index.php?lang=en. Then the second rule passes, and rewrites to /index.php?mod=index.php.

Use the [L] option to stop processing once a given rule passes:

RewriteCond %{REQUEST_URI} ^/(pe|en|fr|sp|ar)/$ 
RewriteRule ^([^/]*)/$ index.php?lang=$1 [L]

RewriteCond %{REQUEST_URI} !^/(pe|en|fr|sp|ar)$ 
RewriteRule ^([^/]*)$ index.php?mod=$1 [L]

You're capturing the index.php. Ignore existing files and directories, and stop processing rules with [L]

RewriteCond %{REQUEST_URI} ^/(pe|en|fr|sp|ar)/$ 
RewriteRule ^([^/]*)/$ index.php?lang=$1 [L]

# Don't rewrite index.php or other existing file/dir
RewriteCond %{REQUEST_URI} !-f
RewriteCond %{REQUEST_URI} !-d
RewriteCond %{REQUEST_URI} !^/(pe|en|fr|sp|ar)$ 
RewriteRule ^([^/]*)$ index.php?mod=$1 [L]

This one works fine for me:

RewriteRule ^(pe|en|fr|sp|ar)/$ index.php?lang=$1 [L]

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^(?!(?:pe|en|fr|sp|ar)/)([^/]*)$ index.php?mod=$1 [L]

1. You definitely have to use [L] flag in such situations

2. I got rid of RewriteCond in first rule -- the pattern is simple enough and no need in having separate condition (which means 2 matches has to be done instead of 1 in my implementation).

3. In second rule use %{REQUEST_FILENAME} to check if requested resource (original or already rewritten) in not a real file/folder and only then rewrite. This will prevent that double rewrite that you facing.

4. I have also got rid of RewriteCond here as rule is not too complex (it's more difficult to read, especially if your regex skills are not great, but it is working). This also makes my answer a bit different to already provided :)