Unescape with pipe

Question

Given this file

$ cat foo.txt
\"That's funny, haha\"

I can unescape the double quotes with read

$ read bar < foo.txt

$ echo $bar
"That's funny, haha"

However can this be done with a pipe? Something like

cat foo.txt | unescape

Answer 1

This seems to do it

sed -r 's/\\(.)/\1/g'