[
        /\\\s/g,
        () => SPACE
    ],

    // Escape metacharacters
    // which is written down by users but means special for regular expressions.

    // > There are 12 characters with special meanings:
    // > - the backslash \,
    // > - the caret ^,
    // > - the dollar sign $,
    // > - the period or dot .,
    // > - the vertical bar or pipe symbol |,
    // > - the question mark ?,