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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
.
system::result< core::string_view > = [link url.ref.boost__urls__grammar__parse `parse`]( "Johnny42" , [link url.ref.boost__urls__grammar__token_rule `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>