// `\` is escaped by step 3
        /(\\)?\[([^\]/]*?)(\\*)($|\])/g,
        (match, leadEscape, range, endEscape, close) => leadEscape === ESCAPE
            // '\\[bar]' -> '\\\\[bar\\]'
            ? `\\[${range}${cleanRangeBackSlash(endEscape)}${close}`
            : close === ']'
                ? endEscape.length % 2 === 0
                    // A normal case, and it is a range notation