bug#39978: Weird substitution of square brackets

[Evangelos Tsagkas]

~$ sed --version
sed (GNU sed) 4.8
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On Sat, Mar 7, 2020 at 10:17 PM Evangelos Tsagkas <address@hidden>
wrote:

> $ echo "object[0])" | sed 's/[\]\[]/./g'
> object[0])
> $ echo "object[0])" | sed 's/[\]]/./g'
> object[0])
> $ echo "object[0])" | sed 's/[\[]/./g'
> object.0])
> $ echo "object[])" | sed 's/[\]\[]/./g'
> object[])
> $ echo "object[])" | sed 's/[\[\]]/./g'
> object.)
>
>