...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
The set of letters and digits.
Defined in header <boost/url/grammar/alnum_chars.hpp>
constexpr implementation-defined alnum_chars;
Character sets are used with rules and the functions find_if
and find_if_not
.
result< string_view > = parse( "Johnny42", token_rule( alnumchars ) );
ALNUM = ALPHA / DIGIT ALPHA = %x41-5A / %x61-7A ; A-Z / a-z DIGIT = %x30-39 ; 0-9
find_if
,
find_if_not
,
parse
,
token_rule
.
Convenience header <boost/url/grammar.hpp>