----------------------------
Options +FollowSymLinks　#なんだこれ？
RewriteEngine On　#URLの書き換えを宣言するみたいなもの

RewriteCond %{HTTP_USER_AGENT} DoCoMo [NC,OR]　#ブラウザのエージェントで判断
RewriteCond %{HTTP_USER_AGENT} J-PHONE [NC,OR]　#[NC]は大文字小文字の区別なし
RewriteCond %{HTTP_USER_AGENT} KDDI [NC,OR]　#[OR]はOR検索を意味する
RewriteCond %{HTTP_USER_AGENT} MOT [NC,OR]　#[]の中は,でつなぐ(スペースなし)
RewriteCond %{HTTP_USER_AGENT} DDIPOKET [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Vodafone [NC,OR]
RewriteCond %{HTTP_USER_AGENT} SoftBank [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Nokia [NC,OR]
RewriteCond %{HTTP_USER_AGENT} L-mode [NC,OR]
RewriteCond %{HTTP_USER_AGENT} UP.Browser [NC,OR]
RewriteCond %{HTTP_USER_AGENT} WILLCOM [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ASTEL [NC,OR]
RewriteCond %{HTTP_USER_AGENT} PDXGW [NC,OR]
RewriteCond %{HTTP_USER_AGENT} KYOCERA [NC]
RewriteCond %{REQUEST_FILENAME} blog/　#これにあてはまるリクエストを受けたら以下の変換
RewriteRule blog/([0-9]+)\.html$ /mt/mt4i.cgi?id=1&mode=individual&eid=$1 [R]

#　条件などのファイル名は.htaccessから見た形で表記
#　正規表現を使える。()の中は変換後の中で$1で参照できる。

RewriteCond %{HTTP_USER_AGENT} DoCoMo [NC,OR]
RewriteCond %{HTTP_USER_AGENT} J-PHONE [NC,OR]
RewriteCond %{HTTP_USER_AGENT} KDDI [NC,OR]
RewriteCond %{HTTP_USER_AGENT} MOT [NC,OR]
RewriteCond %{HTTP_USER_AGENT} DDIPOKET [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Vodafone [NC,OR]
RewriteCond %{HTTP_USER_AGENT} SoftBank [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Nokia [NC,OR]
RewriteCond %{HTTP_USER_AGENT} L-mode [NC,OR]
RewriteCond %{HTTP_USER_AGENT} UP.Browser [NC,OR]
RewriteCond %{HTTP_USER_AGENT} WILLCOM [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ASTEL [NC,OR]
RewriteCond %{HTTP_USER_AGENT} PDXGW [NC,OR]
RewriteCond %{HTTP_USER_AGENT} KYOCERA [NC]
RewriteCond %{REQUEST_FILENAME} blog/
RewriteRule blog/cat_([0-9]+).*\.html$ /mt/mt4i.cgi?cat=$1&id=1 [R]

RewriteCond %{HTTP_USER_AGENT} DoCoMo [NC,OR]
RewriteCond %{HTTP_USER_AGENT} J-PHONE [NC,OR]
RewriteCond %{HTTP_USER_AGENT} KDDI [NC,OR]
RewriteCond %{HTTP_USER_AGENT} MOT [NC,OR]
RewriteCond %{HTTP_USER_AGENT} DDIPOKET [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Vodafone [NC,OR]
RewriteCond %{HTTP_USER_AGENT} SoftBank [NC,OR]
RewriteCond %{HTTP_USER_AGENT} Nokia [NC,OR]
RewriteCond %{HTTP_USER_AGENT} L-mode [NC,OR]
RewriteCond %{HTTP_USER_AGENT} UP.Browser [NC,OR]
RewriteCond %{HTTP_USER_AGENT} WILLCOM [NC,OR]
RewriteCond %{HTTP_USER_AGENT} ASTEL [NC,OR]
RewriteCond %{HTTP_USER_AGENT} PDXGW [NC,OR]
RewriteCond %{HTTP_USER_AGENT} KYOCERA [NC]
RewriteRule ^$ /mt/mt4i.cgi?id=1 [R]
----------------------------

http://blog.goo.ne.jp/logoline99/e/ed321667fb0aa196176a5eec703d9fe2
http://d.hatena.ne.jp/qinglong/20060901/p1
http://it.kndb.jp/entry/show/id/2328
http://www.ksknet.net/apache/rewritecond_rew.html
http://d.hatena.ne.jp/ALMIC/20060727
http://www.avis.ne.jp/user-support/homepage/hosting/mode_t.html
http://document.secure.ne.jp/tools/htaccess/htaccess.php