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The set of visible characters.
Defined in header <boost/url/grammar/vchars.hpp>
constexpr implementation-defined vchars;
Character sets are used with rules and the functions find_if and find_if_not.
result< string_view > rv = parse( "JohnDoe", token_rule( vchars ) );
VCHAR = 0x21-0x7E ; visible (printing) characters
find_if,
find_if_not,
parse,
token_rule.
Convenience header <boost/url/grammar.hpp>