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peg::parser!( grammar test() for str {
pub rule alphanumeric() = ['a'..='z' | 'A'..='Z' | '0'..='9']*
pub rule inverted_pat() -> &'input str = "(" s:$([^')']*) ")" {s}
pub rule capture() -> char = ['a'..='z']
pub rule capture2() -> (char, char) = a:['a'..='z'] b:['0'..='9'] { (a, b) }
pub rule open_range() -> char = ['a'..]
pub rule if_guard() -> char = [x if x.is_ascii_digit()]
});
fn main() {
assert!(test::alphanumeric("azAZ09").is_ok());
assert!(test::alphanumeric("@").is_err());
assert_eq!(test::inverted_pat("(asdf)"), Ok("asdf"));
assert_eq!(test::capture("x"), Ok('x'));
assert_eq!(test::capture2("a1"), Ok(('a', '1')));
assert_eq!(test::if_guard("1"), Ok('1'));
assert!(test::if_guard("a").is_err());
}
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