Bit string format
The format for coding a bit string mask is:
B'bbbbbbbb...bbbbbbbb'
The value bbbbbbbb represents 8 bits that constitute a byte. Each bit must be 1 (test bit) or 0 (ignore bit). You can specify up to 256 groups of 8 bits. The total number of bits in the mask must be a multiple of 8. A bit mask string can only be used with a bit operator.