How to replace pairs tags with regexp

[Antonio Corbi via Digitalmars-d-learn]

On Friday, 21 July 2017 at 07:08:34 UTC, Suliman wrote:
> On Friday, 21 July 2017 at 06:19:43 UTC, Suliman wrote:
>> There reason of issue above is spaces before "#".
>
> What wrong with next regex https://dpaste.dzfl.pl/024a47ed2a56
>
> I expect that it will select:
>
> #Header
> my header text
>
> ##SubHeader
> my sub header text
>
> Because: ^#{3}

Have you tried https://regex101.com/

It gives you results and explanations about your regex in 
realtime.

A. Corbi