RewriteEngine On

# page 
RewriteRule ^([a-zA-Z0-9_]+)/([[:digit:]]+)page$ ./index.php?mid=$1&page=$2 [L]

# administrator page
RewriteRule ^admin$ ./index.php?module=admin [L]

# document permanent link
RewriteRule ^([[:digit:]]+)$ ./index.php?document_srl=$1 [L]

# document + act permanent link
RewriteRule ^([[:digit:]]+)/([a-zA-Z0-9_]+)$ ./index.php?document_srl=$1&act=$2 [L]

# mid + document permanent link
RewriteRule ^([a-zA-Z0-9_]+)/([[:digit:]]+)$ ./index.php?mid=$1&document_srl=$2 [L]

# mid + act permanent link
RewriteRule ^([a-zA-Z0-9_]+)/([a-zA-Z0-9_]+)$ ./index.php?mid=$1&act=$2 [L]

# module permanent link
RewriteRule ^([a-zA-Z0-9_]+)(/){0,1}$ ./index.php?mid=$1 [L]