htaccess中的正则表达式无法在服务器上运行

I have the following regex in the .htaccess file, its working fine in my local machine, but on the server localhost this will not work If I have the \/ in the regular expression

RewriteEngine on
RewriteRule ^orders\/ order.php [L]

My url will looks like localhost/items/orders/casio-watch.

*Here items is the foldername

Please help, Thanks in advance

Use a RewriteBase statement in your .htaccess:

RewriteBase /items