Method is_match_empty

regex/regex-syntax/src/hir/mod.rs:686–688

Return true if and only if the empty string is part of the language matched by this regular expression. This includes `a*`, `a?b*`, `a{0}`, `()`, `()+`, `^$`, `a|b?`, `\B`, but not `a`, `a+` or `\b`.

(&self)

    /// This includes `a*`, `a?b*`, `a{0}`, `()`, `()+`, `^$`, `a|b?`, `\B`,
    /// but not `a`, `a+` or `\b`.
    pub fn is_match_empty(&self) -> bool {
        self.info.is_match_empty()
    }

    /// Return true if and only if this HIR is a simple literal. This is only
    /// true when this HIR expression is either itself a `Literal` or a