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/

 

[Mahares]

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

You never quit Mario. I quickly tested and it shows 4 elements in B4A

Dim components() As String
    components = Regex.Split("", "1234")
    Log(components.Length)
    For i =0 To components.Length-1
        Log(components(i))
    Next

 

[LucaMs]

 

[Sagenut]

I tested it too and I got 4 elements.

 

[LucaMs]

I tested it too and I got 4 elements.

 

[Sagenut]

Where Regex come from?
Is it included in Java JDK?
Could it be something related to the Java version?
@LucaMs which version of Java do you have in your path?
I tested with Open JDK 14 and 17.

 

[LucaMs]

Where Regex come from?
Is it included in Java JDK?
Could it be something related to the Java version?
@LucaMs which version of Java do you have in your path?
I tested with Open JDK 14 and 17.

That's exactly what I was writing:

I can't think of a reason; Is it possible that it depends on the jdk used?


JDK 8

 

[LucaMs]

Changed to jdk 14: same result, 5 strings

 

[MarcoRome]

Changed to jdk 14: same result, 5 strings

 

[Spavlyuk]

I tested with Java 8 & 11 and don't get the empty string at the beginning either.

 

[OliverA]

@lucas, can you upload the project that produces this issue?

 

[LucaMs]

@lucas, can you upload the project that produces this issue?

I tested the code in a B4XPages project I use for tests. It contains other stuff.

Just now I created a new "default" project, compiled with jdk 14.0.1 (javac.exe, of course): 5 strings!

 

[LucaMs]

Just now I created a new "default" project, compiled with jdk 14.0.1 (javac.exe, of course): 5 strings!

Is it possible that even when I compile with jdk 14 javac.exe other jdk 8 files are used? But if that were the case, why doesn't the same thing happen with B4J?

 

[LucaMs]

I uninstalled them. Again 5 strings (jdk 14.0.1)

 

[Sabotto]

Me: 5 strings

 

[OliverA]

It has nothing to do with the JDK you're using, but Android's implementation of (java.util.regex.Pattern) (if it is an actual problem). Are you doing this on a real device? What Android version?

Links:

B4A/B4AObjects/src/anywheresoftware/b4a/keywords/Regex.java at 2aeca9711cff3d32587a927935f6a34cc6655672 · AnywhereSoftware/B4A

B4A core libraries. Contribute to AnywhereSoftware/B4A development by creating an account on GitHub.

github.com

https://developer.android.com/reference/java/util/regex/Pattern

 

[Sagenut]

I am speechless

 

[OliverA]

This may be related to this issue:

Splitting a String works in Java, doesn't work on Android

So I have this logic which splits a String by 4 characters each. Something like this 0108011305080508000000 gives 0108 0113 0508 0508 0000 00 The logic I used is String [] splitErrorCode = input...

stackoverflow.com

 

[LucaMs]

Are you doing this on a real device? What Android version?

Yes, Android 8, but the question was asked by another Italian member, who most likely has a more recent Android.

 

[Sagenut]

This can be a really important information to think about if some user/client report a bug and we are not able to replicate it.
Something to remeber.