boost::urls::grammar::digit_chars :: Boost Libraries Documentation

# boost::urls::grammar::digit_chars

The set of decimal digits

## Synopsis

Declared in `<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`.

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

## BNF

    DIGIT       = %x30-39
                ; 0-9

## Specification

- B.1. Core Rules (rfc5234)

## See Also

`find_if`, `find_if_not`, `parse`, `token_rule`.

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