Delimiters for sed shell command

Today I learned that the sed shell command accepts other delimiters than /. I was trying to run the following:

folder="screens/components"
echo "~/FOLDER/index.js" | sed -e "s/FOLDER/${folder}/g"
# sed: 1: "s/{{folder}}/screens/co ...": bad flag in substitute command: 'c'

But I got a bad flag error. So I changed my delimiter to | and all works fine:

folder="screens/components"
echo "~/FOLDER/index.js" | sed -e "s|FOLDER|${folder}|g"

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