404 htaccess clean url出错

I have a website but i am getting 404 error while using clean url for my post URL

.htaccess code is

RewriteEngine On
RewriteRule ^post/([^/.]+)/?$ post.php?post=$1 [L]
RewriteRule ^([^/.]+)/?$ index.php?page=$1 [L]

Files in Server is like :

index.php
post.php
.htaccess

all in one main public_html folder

this URL is working fine http://www.example.com/1

but i have 404 error in http://www.example.com/post/12345

i don't know what's problem... plz tell me what to do

Try turning off multiviews by adding this somewhere in your htaccess file:

Options -Multiviews