\u0/r0/rcnt[3]

##</code><code>##

 NOR2X0 U2905 ( .IN1(\u0/r0/rcnt[3] ), .IN2(\u0/r0/n43 ), .QN(n1699) );


##</code><code>##

  NOR2X0 U2905 ( .IN1(\u0/r0/n43 ), .IN2(\u0/r0/rcnt[3] ), .QN(n1699) );

##</code><code>##

foreach my $val (@nets_q) {
	$data =~ s/( [NOR|OR].*.IN1\()($val)(\).*IN2\()([^\)]*)(.*)/$1$4$3$2$5/g;
}

##</code><code>##

Unrecognized escape \u passed through in regex;