"${foo}"

##</code><code>##

"$foo"

##</code><code>##

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

##</code><code>##

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

##</code><code>##

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

##</code><code>##

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