Function parser

regex/regex-syntax/src/ast/parse.rs:2311–2313

(pattern: &str)

    }

    fn parser(pattern: &str) -> ParserI<Parser> {
        ParserI::new(Parser::new(), pattern)
    }

    fn parser_octal(pattern: &str) -> ParserI<Parser> {
        let parser = ParserBuilder::new().octal(true).build();