Fixed that ?, got treated as field code leading to that parsing whole information to account owner failed

fints4k/src/commonMain/kotlin/net/dankito/banking/fints/transactions/mt940/Mt940Parser.kt

@@ -58,6 +58,8 @@ open class Mt940Parser : IMt940Parser {
 
         val ReferenceTypeRegex = Regex("[A-Z]{4}\\+")
 
+        val InformationToAccountOwnerSubFieldRegex = Regex("\\?\\d\\d")
+
 
         const val EndToEndReferenceKey = "EREF+"
         const val CustomerReferenceKey = "KREF+"
@@ -318,10 +320,11 @@ open class Mt940Parser : IMt940Parser {
         var primaNotaNumber: String? = null
         var textKeySupplement: String? = null
 
-        informationToAccountOwnerString.substring(3).split('?').forEach { subField ->
+        val subFieldMatches = InformationToAccountOwnerSubFieldRegex.findAll(informationToAccountOwnerString).toList()
-            if (subField.isNotEmpty()) {
+        subFieldMatches.forEachIndexed { index, matchResult ->
-                val fieldCode = subField.substring(0, 2).toInt()
+            val fieldCode = matchResult.value.substring(1, 3).toInt()
-                val fieldValue = subField.substring(2)
+            val endIndex = if (index + 1 < subFieldMatches.size) subFieldMatches[index + 1].range.start else informationToAccountOwnerString.length
+            val fieldValue = informationToAccountOwnerString.substring(matchResult.range.last + 1, endIndex)
 
             when (fieldCode) {
                 0 -> bookingText = fieldValue
@@ -334,7 +337,6 @@ open class Mt940Parser : IMt940Parser {
                 in 60..63 -> referenceParts.add(fieldValue)
             }
         }
-        }
 
         val reference = if (isFormattedReference(referenceParts)) joinReferenceParts(referenceParts)
                     else referenceParts.joinToString(" ")

fints4k/src/commonTest/kotlin/net/dankito/banking/fints/transactions/Mt940ParserTest.kt

@@ -11,6 +11,7 @@ import net.dankito.banking.fints.transactions.mt940.model.StatementLine
 import ch.tutteli.atrium.api.verbs.expect
 import kotlin.test.Test
 import net.dankito.banking.fints.extensions.isFalse
+import net.dankito.banking.fints.extensions.isTrue
 import net.dankito.banking.fints.model.Amount
 import net.dankito.utils.multiplatform.Date
 import net.dankito.utils.multiplatform.DateFormatter
@@ -277,6 +278,40 @@ class Mt940ParserTest : FinTsTestBase() {
         }
     }
 
+    @Test
+    fun `Fix that ?, gets detected as field code`() {
+        val transactionsString = """
+            :20:STARTUMS
+            :25:$BankCode/$CustomerId
+            :28C:0
+            :60F:C200511EUR0,00
+            :61:200511D15,00NMSCNONREF
+            :86:105?00BASISLASTSCHRIFT?10931?20EREF+6MKL2OT30QENNLIU
+            ?21MREF+?,3SQNdUbxm9z7dB)+gKYD?22JAKzCM0G?23CRED+DE94ZZZ00000123456
+            ?24SVWZ+306-4991422-2405949 NI?25LE Mktp DE 6MKL2OT30QENNLIU?26
+            EREF: 6MKL2OT30QENNLIU MRE?27F: ?,3SQNdUbxm9z7dB)+gKYDJA?28KzCM0G
+            CRED: DE94ZZZ0000012?293456 IBAN: DE87300308801234?30TUBDDEDD?31DE87300308801234567890?32NILE PAYMENTS EUROPE S.C.?33A.?34992?60567890 BIC: TUBDDEDD 
+            :62F:D200511EUR15,00
+            -
+        """.trimIndent()
+
+
+        // when
+        val result = underTest.parseMt940String(transactionsString)
+
+
+        // then
+        expect(result).hasSize(1)
+        expect(result.first().transactions).hasSize(1)
+
+        expect(result.first().transactions[0].information?.bookingText).toBe("BASISLASTSCHRIFT")
+        expect(result.first().transactions[0].information?.otherPartyBankCode).toBe("TUBDDEDD")
+        expect(result.first().transactions[0].information?.otherPartyAccountId).toBe("DE87300308801234567890")
+        expect(result.first().transactions[0].information?.endToEndReference).toBe("6MKL2OT30QENNLIU")
+        expect(result.first().transactions[0].information?.mandateReference).toBe("?,3SQNdUbxm9z7dB)+gKYDJAKzCM0G")
+        expect(result.first().transactions[0].information?.sepaReference?.contains("IBAN: DE87300308801234567890 BIC: TUBDDEDD") ?: false).isTrue()
+    }
+
 
     private fun assertBalance(balance: Balance, isCredit: Boolean, bookingDate: Date, amount: Amount) {
         expect(balance.isCredit).toBe(isCredit)