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The unreserved character set.
Defined in header <boost/url/rfc/unreserved_chars.hpp>
constexpr grammar::lut_chars unreserved_chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ" "abcdefghijklmnopqrstuvwxyz" "0123456789" "-._~";
Character sets are used with rules and the functions grammar::find_if and grammar::find_if_not.
result< decode_view > rv = grammar::parse( "Program%20Files", pct_encoded_rule( unreserved_chars ) );
unreserved = ALPHA / DIGIT / "-" / "." / "_" / "~"
grammar::find_if,
grammar::find_if_not,
grammar::parse,
pct_encoded_rule.
Convenience header <boost/url.hpp>