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You  might have faced error where .htaccess wont recognize the backtrack variable after $9 such that if you specify “$10″ then it will return you “0″ as value to that key in URL param. The mod_rewrite module is confused which varible to return $1 or $o. Lets see the problem first,

Problem :

RewriteRule ^tools/chart(/id_([^\/]+))?(/user_([A-Za-z0-9_]+))?(/action_([A-Za-z0-9_]+))?(/date_([A-Za-z0-9_]+))?(/service_([A-Za-z0-9_]+))?(/.+)$ my_php_file.php?id=$2&user=$4&action=$6&date=$8&service=$10&message=$12

Apache’s official website says:
Back-references are identifiers of the form $N (N=0..9), which will be replaced by the contents of the Nth group of the matched Pattern.
In the above RewriteRule, the variables $10 and $11 will return 0 and 1 as values respectively. Now let us look at the workaround to this probelm.

Solution :

RewriteCond %{REQUEST_URI} /(service_([A-Za-z0-9_]+))?(/.+)$
RewriteRule ^tools/chart(/id_([^\/]+))?(/user_([A-Za-z0-9_]+))?(/action_([A-Za-z0-9_]+))?(/date_([A-Za-z0-9_]+))?(/service_([A-Za-z0-9_]+))?(/.+)$ my_php_file.php?id=$2&user=$4&action=$6&date=$8&service=%2&message=%3

Using the above RewriteCond and RewriteRule we can grab the values of the group after 9.

Hope this helps

Cheers!!
Realin !