OK - found it.
Search Pattern: `^[0-9]\. `
Replace Pattern: `###\0`

Same for two digits.

I was always trying `\1'...

Thanks Pattern Playground!!!

On Friday, July 7, 2023 at 6:10:51 PM UTC+2 Rainer Krug wrote:

> I have a file as followed:
>
> 4. Leach M et al.: Equity and sustainability in the anthropocene: a
> social–ecological systems perspective on their intertwined
> futures. Glob Sustain 2018, 1
> This important review by some of the leading authorities in the field,
> summarizes the state of knowledge concerning the interlinked challenges
> of equity and sustainability. Emphasizing that they cannot be addressed
> separately, it outlines emerging new thinking which recognizes the 
> multiple perspectives and dimensions involved.
> 24. Scoones I: The politics of sustainability and development. Annu
> Rev Environ Resour 2016:1-27
> 5.Feola G: Societal transformation in response to global
> environmental change: a review of emerging concepts. Ambio
> 2014, 44:376-390.
>
> Now I want to remove all line breaks (`\n`) except for the ones where the 
> lines starts with a number followed by `.`.
>
> I was thinking: Replace all `xx. ` with `####xx. ` - but how can I do this?
>
> After that, I could remove all `\n` and replace `####` with `\n` and 
> I have it.
>
> Any suggestions?
>
> Thanks,
>
> Rainer
>
>

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