The sub-delims character set
const lut_chars sub_delim_chars ;
Declared in file <boost/url/rfc/sub_delim_chars.hpp> at line 45
Character sets are used with rules and the functions grammar::find_if and grammar::find_if_not.
system::result< decode_view > = grammar::parse( "Program%20Files", pct_encoded_rule( sub_delim_chars ) );
sub-delims = "!" / "$" / "&" / "'" / "(" / ")"
/ "*" / "+" / "," / ";" / "="