Android Question Regex B4A & B4J

[LucaMs]

    Dim components() As String
    components = Regex.Split("", "1234")

B4A: 5 strings - "" "1" "2" "3" "4"
B4J: 4 strings - "1" "2" "3" "4"

https://www.b4x.com/android/forum/threads/regex-split.157791/

 

[LucaMs]

Solved so:

    Dim components() As String
'   components = Regex.Split("", "1234")
    components = Regex.Split("(?<=.)", "1234")
    Log("Length: " & components.Length)
    For i = 0 To components.Length - 1
        Log("Component " & components(i))
    Next

But who solved it that way? ChatGPT

 

[MarcoRome]

Yes, same code, different behaviors.
It depends on the android version.
on a device ( all real device ) with:
Android 8 I have the 5 values (wrong)
Android 11 is fixed
Android 13 is fixed

 

[OliverA]

Found the answer on stackoverflow. The behavior when dealing with an empty String pattern has changed between Java 7 and Java 8. Depending on the version of Android, you may be dealing with Java 6, 7 or 8. This has nothing to do with the with the JDK you use in B4A to generate you APK, but with the Java implemented within Android.

This is the expected behavior for String#split for Java version up to 7 and has been changed in Java 8: Why in Java 8 split sometimes removes empty strings at start of result array?
– Tom
Jul 21, 2016 at 20:44

Source: https://stackoverflow.com/q/38513563 (see the comments)

• @HoangHuynh you may use JDK 6 or above for Android development. However, the compilation supports Java version 6 (and 7 in case of KitKat). I think what the OP meant is also for java version (not JDK)
  – waqaslam
  Apr 27, 2014 at 1:01
• 13
  Java 8 is OFFICIALLY supported in Android N. android-developers.blogspot.com/2016/03/…
  – Jason
  Mar 9, 2016 at 18:45

Source: https://stackoverflow.com/q/38513563 (see the comments)