REGEX Transformation in rules

Setup, Configuration and Use Beginners
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1

I need some help with REGEX transformation in rules:

I execute in a bash script with the executecommandline command, receive either a negative integer (e.g. „-14“) or some text und a negative integer (e.g. „some text -14) and put in a string var.

Now I want to extract only the integer value (negativ or positiv doesn’t matter). I thought the easiest way to do that would be a REGEX transformation, but unfortunately I can’t get it work or rather I don’t know exactly which syntax is the right one.

I tried

var	Number shortened = transform("REGEX", longString, ".*[0-9]")

and some variation of that.

Could someone give me a hint, to do it the right way?
Thanks!

2

I think you have the arguments in the wrong order. I think it goes:

transform("REGEX", expression, string)

At least that is my interpretation from the docs.

3

Thanks for your replay
That doesn’t work either. The result is always null (openhab log shows no error)

4

Simplify and try to get the string fragment you want, before trying to convert to number in same operation

5

Ok, now I’m able to catch the string fragment i want (I added the §-sign in the bash script to have a good point to split)

var	String[] splitedString = longString.split("§")
var pieceofString = new String(splitedString.get(1))

Now I have the part of the String (e.g. -12) as a String, but I’m not able to convert this to a Number. So I need some help with that.

6

Got it:

var newNumber = Integer::parseInt(pieceofString)