boost::urls::grammar::alnum_chars

The set of letters and digits

Synopsis

Declared in header <boost/url/grammar/alnum_chars.hpp>

constexpr
implementation-defined alnum_chars = {};

Description

Example

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

system::result< core::string_view > = parse( "Johnny42", token_rule( alnumchars ) );

BNF

ALNUM       = ALPHA / DIGIT

ALPHA       = %x41-5A / %x61-7A
            ; A-Z / a-z

DIGIT       = %x30-39
            ; 0-9

Specification

B.1. Core Rules (rfc5234)

See Also

find_if , find_if_not , parse , token_rule .