Hi. I've found the bug using sed. There is how to reproduce:

1) Run bash

2) Exec command \

echo weather -5.0 | sed 's/[^0-9\-\.]//g'                                                        

3) You will get "5.0". Expected output is "-5.0"

BUT

If you exec

echo weather -5.0 | sed 's/[^0-9\.\-]//g'

you''ll get the correct output "-5.0".

I am using GNU sed version 4.5 on Manjaro Linux.