The set of decimal digits.

Synopsis

Defined in header <boost/url/grammar/digit_chars.hpp>

constexpr implementation-defined digit_chars;

Example

Character sets are used with rules and the functions find_if and find_if_not.

result< string_view > rv = parse( "2022", token_rule( digit_chars ) );

BNF

DIGIT       = %x30-39
            ; 0-9

Specification

See Also

find_if, find_if_not, parse, token_rule.

Convenience header <boost/url/grammar.hpp>