Bitstring Functions

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Function	Description	Example	Result
`bit_position(``substring``,` `bitstring``)`	Returns first starting index of the specified substring within bits, or zero if it is not present. The first (leftmost) bit is indexed 1	`bit_position('010'::BIT, '1110101'::BIT)`	`4`
`bitstring(``bitstring``,` `length``)`	Pads the bitstring until the specified length	`bitstring('1010'::BIT, 7)`	`0001010`
`get_bit(``bitstring``,` `index``)`	Extracts the nth bit from bitstring; the first (leftmost) bit is indexed 0	`get_bit('0110010'::BIT, 2)`	`1`
`set_bit(``bitstring``,` `index``,` `new_value``)`	Sets the nth bit in bitstring to newvalue; the first (leftmost) bit is indexed 0. Returns a new bitstring	`set_bit('0110010'::BIT, 2, 0)`	`0100010`

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