删除目录和设置正则表达式重定向

I have a type of URL that I need to adjust for better usability, etc... We have a non-working regex right now and we're using a WP redirect plugin called 'Redirection', which allows us to use regex to mass redirect URLs. You should know that we use a reverse proxy to send traffic to our subdomain /blog/ which is on another server.

Here is the first one: https://www.example.com/blog/index.php/this-is-a-blog-post/

Remove "index.php" from all site urls.

so the previous url for example would be: https://www.example.com/blog/this-is-a-blog-post/

We are using this regex unsuccessfully to target the urls:

(.*?)index\.php/*(.*)

Have you tried escaping the slash after index.php?

(.*?)index\.php\/*(.*)

https://regex101.com/r/2BMVwO/1