.htaccess - why this doesnt work? rewriting URL -

i want rewrite url: /pit/employee/student-profile/2

this works:

rewriterule ^employee/([0-9]+) employee/student-profile.php?id=$1 

this doesn't work:

rewriterule ^employee/student-profile/([0-9]+) employee/student-profile.php?id=$1 

i want this: /pit/employee/student-profile/2