Rewrite rule for .htaccess for rewritting /page/subpage to ?page=page&subpage=subpage

.htaccess

# redirects for url params
RewriteEngine On
RewriteRule ^([a-zA-Z0-9-z\-\_]+)$ index.php?page=$1
RewriteRule ^([a-zA-Z0-9-z\-\_]+)/$ index.php?page=$1
RewriteRule ^([a-zA-Z0-9-z\-\_]+)/([a-zA-Z0-9-z\-\_]+)$ index.php?page=$1&subpage=$2
RewriteRule ^([a-zA-Z0-9-z\-\_]+)/([a-zA-Z0-9-z\-\_]+)/$ index.php?page=$1&subpage=$2

# index file priority
DirectoryIndex index.html index.htm index.php welcome.html

# forbid file listing for root and subdirectories
Options All -Indexes