Method is_valid

regex/regex-syntax/src/ast/mod.rs:1020–1022

Returns true if and only if this character class range is valid. The only case where a range is invalid is if its start is greater than its end.

(&self)

    /// The only case where a range is invalid is if its start is greater than
    /// its end.
    pub fn is_valid(&self) -> bool {
        self.start.c <= self.end.c
    }
}

/// A union of items inside a character class set.