Parity bit - Error detecting code.js

/*
Description:
In telecomunications we use information coding to detect and prevent errors while sending data.

A parity bit is a bit added to a string of binary code that indicates whether the number of 1-bits in the string is even or odd. Parity bits are used as the simplest form of error detecting code, and can detect a 1 bit error.

In this case we are using even parity: the parity bit is set to 0 if the number of 1-bits is even, and is set to 1 if odd.

We are using them for the transfer of ASCII characters in binary (7-bit strings): the parity is added to the end of the 7-bit string, forming the 8th bit.

In this Kata you are to test for 1-bit errors and return a new string consisting of all of the correct ASCII caracters in 7 bit format (removing the parity bit), or "error" in place of ASCII characters in which errors were detected.

For more information on parity bits: https://en.wikipedia.org/wiki/Parity_bit

Examples
Correct 7 bit string with an even parity bit as the 8th bit:

"01011001" <-- The "1" on the right is the parity bit.
In this example, there are three 1-bits. Three is an odd number, and the parity bit is set to 1. No errors are detected, so return "0101100" (7 bits).

Example of a string of ASCII characters:

"01011001 01101110 01100000 01010110 10001111 01100011"
This should return:

"0101100 error 0110000 0101011 error 0110001"
*/
function parityBit(binary) {
  return binary.replace(/\b0*1(0*10*1)*0*\b/g, 'error').replace(/\d{8}/g, d => d.slice(0, 7));
}