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"${foo}"

"$foo"

print qq|...contatc=|. uri_escape( $address ) .qq|...|;

printf qq|...contatc=%s...|, uri_escape( $address );

my $address_uri = uri_escape( $address );
print qq|...contatc=$address_uri...|;

print qq|...contatc=${\( uri_escape( $address ) )}...|;