Rewrite rule for nginx from Apache

[Robert Gabriel]

Can anyone tell me how to rewrite this rules from apache:

RewriteEngine On
RewriteRule ^shorten/(.*)$ shorten.php?longurl=$1 [L]
RewriteRule ^([0-9a-zA-Z]{1,6})$ redirect.php?url=$1 [L]

to nginx?

Thanks!
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