extension String {
  func uniqueColor() -> UIColor {
    do {
      // Change each non-hex character to 0
      let regex = try NSRegularExpression(pattern: "[^a-fA-F0-9]", options: NSRegularExpression.Options.caseInsensitive)
      let range = NSMakeRange(0, self.count)
      let nonHexString = regex.stringByReplacingMatches(in: self, options: [], range: range, withTemplate: "0")

      // Add 0's to the string until its length is a multiple of 3
      var multipleOfThreeString = nonHexString
      while multipleOfThreeString.count % 3 != 0 {
        multipleOfThreeString.append("0")
      }

      // Divide string into 3 equal parts
      let equaLengthStrings = multipleOfThreeString.split(by: multipleOfThreeString.count / 3)

      // While the length of the sub-strings is greater than 2, and all three of the sub-strings begin with a 0, remove the leading 0s from each string.
      var nonStartingCeroString = equaLengthStrings
      while nonStartingCeroString[0].count > 2 && nonStartingCeroString[0].first == "0" && nonStartingCeroString[1].first == "0" && nonStartingCeroString[2].first == "0" {
          nonStartingCeroString[0].removeFirst()
          nonStartingCeroString[1].removeFirst()
          nonStartingCeroString[2].removeFirst()
      }

      // If the length of the sub-strings is still greater than 2, then truncate each substring to 2 characters.
      let r = nonStartingCeroString[0].prefix(2)
      let g = nonStartingCeroString[1].prefix(2)
      let b = nonStartingCeroString[2].prefix(2)

      let rgbString = r.appending(g).appending(b)
      return UIColor(hexString: rgbString)
    } catch {
      return UIColor.black
    }
  }

  func split(by length: Int) -> [String] {
    var startIndex = self.startIndex
    var results = [Substring]()

    while startIndex < self.endIndex {
      let endIndex = self.index(startIndex, offsetBy: length, limitedBy: self.endIndex) ?? self.endIndex
      results.append(self[startIndex..<endIndex])
      startIndex = endIndex
    }
    return results.map { String($0) }
  }
}