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The set of decimal digits.
Defined in header <boost/url/grammar/digit_chars.hpp>
constexpr implementation-defined digit_chars;
Character sets are used with rules and the functions find_if and find_if_not.
system::result< core::string_view > rv = parse( "2022" , token_rule( digit_chars ) );
DIGIT = %x30-39 ; 0-9
find_if,
find_if_not,
parse,
token_rule.
Convenience header <boost/url/grammar.hpp>