Defined in github.com/aws/aws-sdk-go/service/iam/api.go
The path prefix for filtering the results. This parameter is optional. If it is not included, it defaults to a slash (/), listing all policies.
The regex pattern (http://wikipedia.org/wiki/regex) for this parameter is a string of characters consisting of either a forward slash (/) by itself or a string that must begin and end with forward slashes, containing any ASCII character from the ! (\u0021) thru the DEL character (\u007F), including most punctuation characters, digits, and upper and lowercased letters.