Method named_group

std/re/src/main/parser.rs:190–197

Assign the index before the body so order matches paren order. */

(&mut self, name: String)

    /* Assign the index before the body so order matches paren order. */
    fn named_group(&mut self, name: String) -> Result<Node, ParseError> {
        self.group_count += 1;
        let index = self.group_count;
        self.names.push((name.clone(), index));
        let node = self.alternation()?;
        self.expect(')')?;
        Ok(Node::Group { index, name: Some(name), node: Box::new(node) })
    }

    fn named_backref(&mut self, name: &str) -> Result<Node, ParseError> {
        let idx = self.names.iter().find(|(n, _)| n == name).map(|(_, i)| *i);