Method is_empty

regex/regex-syntax/src/hir/mod.rs:719–724

Return true if and only if this HIR is the empty regular expression. Note that this is not defined inductively. That is, it only tests if this kind is the `Empty` variant. To get the inductive definition, use the `is_match_empty` method on [`Hir`](struct.Hir.html).

(&self)

    /// this kind is the `Empty` variant. To get the inductive definition,
    /// use the `is_match_empty` method on [`Hir`](struct.Hir.html).
    pub fn is_empty(&self) -> bool {
        match *self {
            HirKind::Empty => true,
            _ => false,
        }
    }

    /// Returns true if and only if this kind has any (including possibly
    /// empty) subexpressions.