Twitter Like URL but with a #'s? - .htaccess

Question

I am making a social networking website, and I can't get this done:
If the url is http://url.com/#username, I want it to show the http://url.com/user?u=username page, but show http://url.com/#username URL.
However, if there is no # in the beginning, treat it like a regular URL.
This is my .htaccess file:
Options +FollowSymLinks
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME}.php -f
RewriteRule ^(.*)$ $1.php [NC,L]
RewriteCond %{SCRIPT_FILENAME} !-d
RewriteCond %{SCRIPT_FILENAME} !-f
RewriteRule ^/(\d+)*$ ./user.php?u=$1
The last three lines are what I tried, however that does not work as I wanted it to. I thought it would work because RewriteRule ^/(\d+)*$ takes any URI after the slash, and rewrites it to .user.php?u=*, but that didn't work, so I am looking for some suggestions on what to do next.

Answer 1

From my understanding of your question, this should work.
Options +FollowSymLinks
RewriteEngine On
RewriteCond %{SCRIPT_FILENAME} !-d
RewriteCond %{SCRIPT_FILENAME} !-f
RewriteRule ^#(.+?)$ user.php?u=$1 [NC,L]
It requires you to have a # before the username and it passes it as a GET variable (u) However, a person can add other characters which could confuse it as a username.
/#username/muffins
But if you want this, and to have pages per username (ie, /#username/info, /#username/about, etc) you can just use the explode() function in PHP.
If you just want it to get the username and nothing else, you can try
RewriteRule ^#([A-Za-z0-9]+)$ user.php?u=$1 [NC,L]
Hope this helps! :)