shithub: kwa

ref: 8e3c92b4eae6ff958d8af946caf6fb7d7f3bfbf7
dir: /test/t.gsub4/

length($1) == 0 { next }

{gsub("[" $1 "]","(&)"); print}
{gsub("[" $1 "]","(\\&)"); print}