boost::urls::grammar::dec_octet_rule :: Boost Libraries Documentation

# boost::urls::grammar::dec_octet_rule

Match a decimal octet

## Synopsis

Declared in `<boost/url/grammar/dec_octet_rule.hpp>`

    constexpr /* implementation-defined */ dec_octet_rule = {};

## Description

A decimal octet is precise way of saying a number from 0 to 255. These are commonly used in IPv4 addresses.

## Value Type

    using value_type = unsigned char;

## Example

Rules are used with the function `parse`.

    system::result< unsigned char > rv = parse( "255", dec_octet_rule );

## BNF

    dec-octet   = DIGIT                 ; 0-9
                / %x31-39 DIGIT         ; 10-99
                / "1" 2DIGIT            ; 100-199
                / "2" %x30-34 DIGIT     ; 200-249
                / "25" %x30-35          ; 250-255

## Specification

- https://datatracker.ietf.org/doc/html/rfc3986#section-3.2.2

## See Also

`parse`.

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