Function snarkvm_circuit::opt
[−]Expand description
Optional parser: Will return None
if not successful.
use nom::combinator::opt;
use nom::character::complete::alpha1;
fn parser(i: &str) -> IResult<&str, Option<&str>> {
opt(alpha1)(i)
}
assert_eq!(parser("abcd;"), Ok((";", Some("abcd"))));
assert_eq!(parser("123;"), Ok(("123;", None)));