pub fn alphanumeric(s: &str) -> Result<()>
Validates that the string is alphanumeric and contains only underscores and dahes as special characters.
Prefix searches with a type followed by a colon (e.g.
fn:) to restrict the search to a given type.
Accepted types are: fn, mod,
struct, enum,
trait, typedef (or
tdef).
Search functions by type signature (e.g.
vec -> usize)