regex - PHP .htaccess removing .php extension and language directory to parameter -

i'm looking regulair expression .htaccess file inside php server.

what want detects language first directory parameter:

• nl
• en
• be
• de

any other options must treated directory or filename. language must given parameter without corrupting other parameters.

also want last / replaced .php.

some examples:

host.com/nl/index/ -> host.com/index.php?lang=nl host.com/de/test/abc/ -> host.com/test/abc.php?lang=de host.com/be/a/b/c/?t=23 -> host.com/a/b/c.php?lang=be&t=23 

is possible? can't work, hope me out!

<ifmodule mod_rewrite.c> rewriteengine on rewritecond %{request_filename} !-f rewritecond %{request_filename}.php -f rewriterule >>> requested expression , replacing pattern <<< </ifmodule> 

rewriterule ^/([a-z]{2})(/.+)/?$ $2.php?lang=$1 [qsa] 

regexes easiest interpret considering piece @ time. let's break down:

• ^ - start of url
• / - match first slash
• ([a-z]{2}) - match , capture 2 letters (goes $1 variable)
• ( - begin capture group (goes $2)
• / - match slash
• .+ - match 0 or more characters
• ) - end capture group ($2)
• /? - match optional end slash of "file path" (but don't capture it)
• $ - end of url

so, you're capturing 2 things:

1. language (capture group $1):

([a-z]{2}) 

2. file path, starting slash (capture group $2), followed optional slash:

(/.+)/? 

finally, qsa flag @ end appends original query string (if there one) rewritten url. if you'd make regex match case-insensitive (i.e. allow urls host.com/nl/index/), can add nc flag too: [qsa,nc]. alternatively, explicitly allow capital letters using [a-za-z] instead of [a-z] in regex.