String+DigitsArabized.swift

extension String {
    var digitsArabized: String {
        do {
            let regex = try NSRegularExpression(pattern: #"\d"#, options: [])
            let arabicDigits = Array("٠١٢٣٤٥٦٧٨٩")
            var mutableSelf = self
            regex.matches(in: self, options: [], range: nsRange).reversed().forEach {
                guard
                    let range = Range($0.range, in: self),
                    let digit = Int(self[range])
                else { return }
                
                mutableSelf.replaceSubrange(range, with: String(arabicDigits[digit]))
            }
            return mutableSelf
        } catch {
            return self
        }
    }
    
    private var nsRange: NSRange {
        let range = startIndex..<endIndex
        return NSRange(range, in: self)
    }
}