Rewrite rules not working

[khav]

I am trying to make  pretty urls using rewrite rules but they are not
working

1.

https://example.com/s1/video.mp4 should be rewrite to 
https://example.com/file/server/video.mp4

location = /s1/(.*)$ {
	 rewrite ^/s1/(.*) /file/server/$1 permanent;
	 }

2.

https://example.com/view/video5353 should be rewrite to
https://example.com/view.php?id=video5353

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,269458,269458#msg-269458