boost::urls::unreserved_chars :: Boost Libraries Documentation

# boost::urls::unreserved_chars

The unreserved character set

## Synopsis

Declared in `<boost/url/rfc/unreserved_chars.hpp>`

    constexpr grammar::lut_chars unreserved_chars = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
        "abcdefghijklmnopqrstuvwxyz"
        "0123456789"
        "‐._~";

## Description

## Example

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

    system::result< decode_view > rv = grammar::parse( "Program%20Files", pct_encoded_rule( unreserved_chars ) );

## BNF

    unreserved    = ALPHA / DIGIT / "-" / "." / "_" / "~"

## Specification

- https://datatracker.ietf.org/doc/html/rfc3986#section-2.3

## See Also

`grammar::find_if`, `grammar::find_if_not`, `grammar::parse`, `pct_encoded_rule`.

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