8 library(uri): Process URIs
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Availability::- use_module(library(uri)).(can be autoloaded)
Source[det]uri_components(+URI, -Components)
[det]uri_components(-URI, +Components)
Break a URI into its 5 basic components according to the RFC-3986 regular expression: 
^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?
 12            3  4          5       6  7        8 9
Components is a term uri_components(Scheme, Authority, Path, Search, Fragment). If a URI is parsed, i.e., using mode (+,-), components that are not found are left uninstantiated (variable). See uri_data/3 for accessing this structure.