网站伪静态规则htaccess文件怎么写？

# apache伪静态规则

将index.php?a=admin&c=login 伪装成admin/login.htm

RewriteRule ^([a-zA-Z_]+)/([a-zA-Z_]+).html$ index.php?a=$1&c=$2

将index.php?c=message 伪装成message.html

RewriteRule ^([a-zA-Z_]+).html$ index.php?c=$1

将index.php?c=message&p=2 伪装成message.html?p=2

RewriteRule ^([a-zA-Z_]+).html?p=([0-9]+)$ index.php?c=$1&p=$2