How to convert Apache rewrite rule to nginx

[Stjames Rash]

Hi

I have a RewriteRule in Apache :

RewriteCond %{QUERY_STRING} came_from=http(.*)

RewriteRule ^/(.*)login_form$
https://%{SERVER_NAME}/$1login_form?came_from=https%1 [NE,L]


 Can somebody let me know the equivalent of the above apache rewrite
rule in nginx

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