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kotlinlang

Hi folks,

I want to extract from an url the substring before `v[0..9]`
e.g:
```<https://baseurl.test/v1/example/{id}>```
the result should be only `<https://baseurl.test/>` 
Where the version number can be 1,2....9

Is there a way to do this?

There is String.substringBefore, but it takes a specific String. For this I think you need to do:
```Regex("v[0-9]").split(url).firstOrNull()```

Also, this would be better asked in <#C0B8Q383C|stdlib>

But splitting is a bit wasty if you use Regex anyway.
Better do it efficiently with a lookahead:
```Regex("^.*?/(?=v[0-9]/)").find(url)?.value```

Thank you guys, the regex is what I missed :slightly_smiling_face: