[#334118A39B74A601D7D9BC9AFBAD202F982AF0C7]
The gen-delims character set
constexpr grammar::lut_chars const gen_delim_chars = ":/?#[]@";
Character sets are used with rules and the functions grammar::find_if and grammar::find_if_not .
system::result< decode_view > rv = grammar::parse( "Program%20Files", pct_encoded_rule( gen_delim_chars ) );
gen-delims = ":" / "/" / "?" / "#" / "[" / "]" / "@"