In RFC 3986

//URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ] 

gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@"
sub-delims = "!" / "$" / "&" / "'" / "(" / ")" / "*" / "+" / "," / ";" / "="

reserved = gen-delims / sub-delims
unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
percent-encoded = "%" HEXDIG HEXDIG

pchar = unreserved / percent-encoded / sub-delims / ":" / "@"

query = *( pchar / "/" / "?" ) // "?" query 
fragment = *( pchar / "/" / "?" ) //"#" fragment


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