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Bash string replacement gives me a "bad replacement"

I have a variable that is a url and I want to replace part of this url in bash, but I keep getting a "bad replacement"

URL="http://hostname/project/branches/Old_Branch/package" SRC="Old_Branch" REP="New_Branch" echo ${$URL/$SRC/$REP}; # desired output is http://hostname/project/branches/New_Branch/package

Not sure where exactly I'm wrong ...

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 URL="http://hostname/project/branches/Old_Branch/package" SRC="Old_Branch" REP="New_Branch" echo "${URL/$SRC/$REP}"

Note no $ sigill for the URL in ${} =)

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