Hi Rainer,

To remove all line breaks (`\n`) except for the ones where the lines starts 
with a number followed by `.` :

Search Pattern : `\n(?!\d+\.)`
Replace Pattern: ` ` 

Note that the Replace pattern is a space to avoid concatenating together 
the lines.

Best regards,

Jean

On Friday, July 7, 2023 at 6:24:09 PM UTC+2 Rainer Krug wrote:

> 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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