Need to find consecutive sequence like "6789" or "abcd" in Swift - swift

Question

I need help to find consecutive sequence for example more than 3 characters in ascending order. I've already implemented one solution but It's not universal.
Examples what should be found - "1234", "abcd", "5678".
And what shouldn't be found - "123", "adced", "123abc", "89:;"
Particularly the case "89:;", symbol ":" - is 58 in uniCode and "9" - is 57, that's why my approach does not work in the case.
Implementation should be in swift.
Additional clarification
For now it would be enough to find the sequences only in English letters and numbers.
private func findSequence(sequenceLength: Int, in string: String) -> Bool {
let scalars = string.unicodeScalars
var unicodeArray: [Int] = scalars.map({ Int($0.value) })
var currentLength: Int = 1
var i = 0
for number in unicodeArray {
if i+1 >= unicodeArray.count {
break
}
let nextNumber = unicodeArray[i+1]
if number+1 == nextNumber {
currentLength += 1
} else {
currentLength = 1
}
if currentLength >= sequenceLength {
return true
}
i += 1
}
return false
}

Answer 1

var data = [1,2,5,4,56,6,7,9,6,5,4,5,1,2,5,4,56,6,7,9,8,1,1,2,5,4,56,6,7,9,8,1,1,2,5,4,56,6,7,9,8,1,1,2,5,4,56,6,7,9,8,1,1,2,5,4,56,6,7,9,8,11,2,5,4,56,6,7,9,8,1,2,3]
for i in 0...data.count{
if i+2 < data.count{
if Int(data[i] + data[i+2]) / 2 == data[i+1] && Int(data[i] + data[i+2]) % data[i+1] == 0 && data[i+1] != 1 && data[i] < data[i+1]{
print(data[i] ,data[i+1], data[i+2])
}
}
}

Answer 2

You can check for sequence with CharacterSet
func findSequence(sequenceLength: Int, in string: String) -> Bool {
// It would be better to extract this out of func
let digits = CharacterSet.decimalDigits
let lowercase = CharacterSet(charactersIn: "a"..."z")
let uppercase = CharacterSet(charactersIn: "A"..."Z")
let controlSet = digits.union(lowercase).union(uppercase)
// ---
let scalars = string.unicodeScalars
let unicodeArray = scalars.map({ $0 })
var currentLength: Int = 1
var i = 0
for number in unicodeArray where controlSet.contains(number) {
if i+1 >= unicodeArray.count {
break
}
let nextNumber = unicodeArray[i+1]
if UnicodeScalar(number.value+1) == nextNumber {
currentLength += 1
} else {
currentLength = 1
}
if currentLength >= sequenceLength {
return true
}
i += 1
}
return false
}
I did assumed that "a" ... "z" and "A"..."Z" are consecutive here, to make it in range, but it may be better do explicitly list all the symbols you want.
Or use CharacterSet.alphanumerics, but is not limited to basic latin alphabet.