unix - Replacing a string with special characters -

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i trying replace set of characters within variable.

var1=''abcd''

i want replace ''' pipe looks like.

|abcd|

i have tried below.

var1=$(sed 's/&apos;/|/g' <<< $var1)

but not working. kindly me out.

edit: original answer incorrect formatted question.

this works 

var1=$(echo "${var1}" | sed 's/&apos;/|/g')

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