"${foo}"
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means

"$foo"
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but anything more complex and $... / ${ ... } becomes a derefence operator. Solutions:

print qq|...contatc=|. uri_escape( $address ) .qq|...|;
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printf qq|...contatc=%s...|, uri_escape( $address );
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my $address_uri = uri_escape( $address );
print qq|...contatc=$address_uri...|;
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print qq|...contatc=${\( uri_escape( $address ) )}...|;
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