Unescape with pipe

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


This seems to do it

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

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