Enum Node 

enum Node {
    Empty,
    Char(char),
    Any,
    Class(ClassData),
    Start,
    End,
    WordBoundary(bool),
    Group {
        idx: Option<usize>,
        node: Box<Node>,
    },
    Concat(Vec<Node>),
    Alt(Vec<Node>),
    Repeat {
        node: Box<Node>,
        min: usize,
        max: Option<usize>,
        greedy: bool,
    },
    Backref(usize),
    Look {
        ahead: bool,
        negate: bool,
        node: Box<Node>,
    },
}

Variants

Empty

Char(char)

Any

Class(ClassData)

Start

End

WordBoundary(bool)

Group

Fields

idx: Option<usize>

node: Box<Node>

Concat(Vec<Node>)

Alt(Vec<Node>)

Repeat

Fields

node: Box<Node>

min: usize

max: Option<usize>

greedy: bool

Backref(usize)

Look

先読み (?=…)/(?!…)・後読み (?<=…)/(?<!…)（位置を進めない）。

Fields

ahead: bool

negate: bool

node: Box<Node>