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Check if an argument looks like an S3 bucket
check_s3_uri(x)
string, URI of an S3 object, should start with s3://, then bucket name and object key
s3://
check_s3_uri('s3://foo/bar') check_s3_uri('https://foo/bar') if (FALSE) { assert_s3_uri('https://foo/bar') }
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