Some advice/tips on htaccess redirect to preserve Search Engine rankings

I'm setting up a site redesign and I want to preserve my page rank. The old site existed in the subdirectory textsite. Ive moved all pages to the root now. I need to first point everything in textsite to the root and then cater for specific changes to page names. The code below doesnt seem to be working. Can someone please help me out?

//301 Redirect Entire Directory:
RedirectMatch 301 textsite(.*) /$1

//redirect individual pages generically:
Redirect 301 aboutus.php http://%{HTTP_HOST}/about_us.php
Redirect 301 contactus.php http://%{HTTP_HOST}/contact_us.php

Thanks a lot!