Creates a new file attribute matcher, which matches attributes against a given string.
[GFileAttributeMatchers][struct@FileAttributeMatcher] are reference counted structures, and are created with a reference count of 1. If the number of references falls to 0, the [struct@FileAttributeMatcher] is automatically destroyed.
The attributes string should be formatted with specific keys separated from namespaces with a double colon. Several
`"namespace:GFileAttributeMatcher:key"` strings may be concatenated with a single comma (e.g. `"standard:
GFileAttributeMatcher:type,standard:GFileAttributeMatcher:is-hidden"`). The wildcard `"*"` may be used to match all
keys and namespaces, or `"namespace::*"` will match all keys in a given namespace.
GFileAttributeMatcher:is-hidden"`: matches only the key is-hidden in the standard namespace.GFileAttributeMatcher:type,unix::*"`: matches the type key in the standard namespace and all keys in the unix
namespace.| attributes |
an attribute string to match. |