Lost on creating a SQL policy to delete items from bucket

I'm trying to create a policy to allow for deleting items from storage. My directory is set as

<myBucket>\this_is_a_pic.jpg

<myBucket>\this_is_a_pic.jpg

<myBucket>\this_is_a_pic.jpg

<myBucket>\this_is_a_pic.jpg. The policy I have is

(bucket_id = 'myBucket'::text)

(bucket_id = 'myBucket'::text)

(bucket_id = 'myBucket'::text)

(bucket_id = 'myBucket'::text).

Thanks!