Method parse_flag

regex/regex-syntax/src/ast/parse.rs:1374–1387

Parse the current character as a flag. Do not advance the parser. # Errors If the flag is not recognized, then an error is returned.

(&self)

    ///
    /// If the flag is not recognized, then an error is returned.
    fn parse_flag(&self) -> Result<ast::Flag> {
        match self.char() {
            'i' => Ok(ast::Flag::CaseInsensitive),
            'm' => Ok(ast::Flag::MultiLine),
            's' => Ok(ast::Flag::DotMatchesNewLine),
            'U' => Ok(ast::Flag::SwapGreed),
            'u' => Ok(ast::Flag::Unicode),
            'x' => Ok(ast::Flag::IgnoreWhitespace),
            _ => Err(self.error(
                self.span_char(),
                ast::ErrorKind::FlagUnrecognized,
            )),
        }
    }

    /// Parse a primitive AST. e.g., A literal, non-set character class or
    /// assertion.