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The set of all letters.
Defined in header <boost/url/grammar/alpha_chars.hpp>
constexpr implementation-defined alpha_chars;
Character sets are used with rules and the functions find_if and find_if_not.
result< string_view > rv = parse( "JohnDoe", token_rule( alpha_chars ) );
ALPHA = %x41-5A / %x61-7A ; A-Z / a-z
find_if,
find_if_not,
parse,
token_rule.
Convenience header <boost/url/grammar.hpp>