Improve IBAN recognition on device

PP-106

CaptureSDK/GiniCaptureSDK/Sources/GiniCaptureSDK/Core/Screens/Camera/IBAN/IBANRecogniser.swift

@@ -6,13 +6,36 @@
 
 import Foundation
 
-func extractIBANS(string: String) -> [String] {
-    var results = [String]()
-    var prefferedIBANs = [String]()
+private func extractIBANMatches(from string: String) -> [NSTextCheckingResult] {
     let stringRange = NSRange(location: 0, length: string.count)
     let allIBANs = IBANKnowledge().universalIBANRegex.matches(in: string, options: [], range: stringRange)
     let iBANsInBlocks = IBANKnowledge().ibanInBlocksRegex.matches(in: string, options: [], range: stringRange)
-    let matches = allIBANs + iBANsInBlocks
+    return allIBANs + iBANsInBlocks
+}
+
+func extractIBANS(string: String) -> [String] {
+    var results = [String]()
+    var prefferedIBANs = [String]()
+    var matches = extractIBANMatches(from: string)
+
+    // try to fix invalid strings
+    if matches.isEmpty, string.count > 2 {
+        var number = String(string.dropFirst(2))
+
+        number = number.replacingOccurrences(of: "s", with: "5")
+        number = number.replacingOccurrences(of: "S", with: "5")
+        number = number.replacingOccurrences(of: "I", with: "1")
+        number = number.replacingOccurrences(of: "i", with: "1")
+        number = number.replacingOccurrences(of: "l", with: "1")
+        number = number.replacingOccurrences(of: "T", with: "1")
+        number = number.replacingOccurrences(of: "o", with: "0")
+        number = number.replacingOccurrences(of: "O", with: "0")
+        number = number.replacingOccurrences(of: "Q", with: "0")
+        number = number.trimmingCharacters(in: .whitespaces)
+        number = number.replacingOccurrences(of: ",", with: "")
+        number = number.replacingOccurrences(of: ".", with: "")
+        matches = extractIBANMatches(from: String(string.prefix(2)) + number)
+    }
 
     for match in matches {
         if let range = Range(match.range, in: string) {