A modern programming language that makes developers happier.

kotlinlang

Hi guys!
I have string like that: `[5-XR6Bwlq, 2-Hada32U1D, 7-aaGE7Ve84]`
I want to get every single number before `-`  and create list of Int with that values.
How I can achive that?

Something like this, but you'll need to consider error handling:
```str.substring(1, str.length - 1).split(", ").map { it.substringBefore("-").toInt() }```

depends really on the details of your input, but something along the lines of
```Regex("""(\d+)-\w+""")
  .findAll(input)
  .map { it.groupValues[1].toInt() }
  .toList()```
might work

<@U3669PPNG> Thanks for help but it causes `NumberFormatException: Infinite or NaN`

<@U01MQG40ZNC> Thank you, works as expected

not for your input. Can you post the input for which my code fails?

&lt;<https://pl.kotl.in/R3atg3-Ax>&gt; is my test code.  I added a version there which tolerates ill-formed input like `[1-ok, b-bad]`  by using
```Regex("""(\d+)-[\w-]+""")
  .findAll(input1)
  .mapNotNull { it.groupValues[1].toIntOrNull() }
  .toList()```

Oh sorry, my bad. It crashes when I converted `null` `.toString()`