Most of PHP applications use internal PHP routing (any MVC framework like ZF, CakePHP… , including wordpress) use a catch-all rewrite rule.
In case a directory needs to be ignored from that (to avoid broken urls falling back to that catch-all route), use a RewriteCond
#.htaccess. Redirect all the URLs to index.php, except the ones  starting with /admin
RewriteCond %{REQUEST_URI} !^/admin
RewriteCond %{REQUEST_FILENAME} -s [OR]
RewriteCond %{REQUEST_FILENAME} -l [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^.*$ index.php [NC,L]
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