Htaccess if url starts with - .htaccess

Question

So I am no hero when it comes to htaccess. So forgive me if I have the complete wrong code below.
Here are the example links (behind each link a number to which I shall refrer bellow to which htaccess part they should be linking to):
website.com/home/ #1
website.com/home/page2/ #1
website.com/projects/ #1 or #2 (doesnt matter since the first GET will be page in both cases)
website.com/projects/staticpage/ #1
website.com/projects/filter1/ #2
website.com/projects/filter1/filter2/ #2
The current code I am using is (part 1):
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_URI} !^/projects/$
RewriteRule ^([-A-Za-z0-9-_]+)/?$ index.php?page=$1 [L,QSA]
RewriteRule ^/?([-A-Za-z0-9-_]+)/([-A-Za-z0-9-_]+)/?$ index.php?page=$1&sub=$2 [L,QSA]
RewriteRule ^/?([-A-Za-z0-9-_]+)/([-A-Za-z0-9-_]+)/([-A-Za-z0-9-_]+)/?$ index.php?page=$1&sub=$2&sub-sub=$3 [L,QSA]
The other bit of the htaccess (part 2):
RewriteEngine On
RewriteBase /
RewriteRule ^([-A-Za-z0-9-_+]+)/?$ index.php?secondpart=$1 [L,QSA]
RewriteRule ^/?([-A-Za-z0-9-_+]+)/([-A-Za-z0-9-_+]+)/?$ index.php?secondpart=$1&filter[]=$2 [L,QSA]
RewriteRule ^/?([-A-Za-z0-9-_+]+)/([-A-Za-z0-9-_+]+)/([-A-Za-z0-9-_+]+)/?$ index.php?secondpart=$1&filter[]=$2&filter[]=$3 [L,QSA]
The filters are dynamic so it is not possible to get them to exclude.
I get it to skip the first part when the url is equal to: website.com/projects/ but,
when I change the url to: website.com/projects/filter1/ I can't get it to grab the second part.
If you could help me fix this thank you very much.

Answer 1

You can do something like this:
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-d [OR]
RewriteCond %{REQUEST_URI} ^/pagesearch/(staticpage1|staticpage2)/
RewriteRule ^ - [L]
RewriteRule ^([\w-]+)/?$ index.php?page=$1 [L,QSA]
RewriteRule ^([\w-]+)/([\w-]+)/?$ index.php?page=$1&sub=$2 [L,QSA]