How to remove multiple given characters from all strings?

Question

linux

How to remove one character is known.

sed -i 's/\;//g' init.txt; # удаление всех точек с запятой
sed -i 's/\,//g' init.txt; # запятых
sed -i 's/\"//g' init.txt; # и кавычек
sed -i 's/\&//g' init.txt; # амперсанда

the question is how to remove them in one line? What regular expression should be written?

Answer 1

If via sed:
sed -i 's/[;,"&]//g' init.txt;

Answer 2

sed -i 's/\;//g; s/\,//g' init.txt;

Answer 3

What regular expression should be written?

Appropriate for what you want it to do.
https://regex101.com/