negative = true
        pattern = pattern.substr(1)
    }

    pattern = pattern
        // > Put a backslash ("\") in front of the first "!" for patterns that
        // >   begin with a literal "!", for example, `"\!important!.txt"`.
        .replace(REGEX_REPLACE_LEADING_EXCAPED_EXCLAMATION, '!')
        // > Put a backslash ("\") in front of the first hash for patterns that
        // >   begin with a hash.