#!/usr/bin/perl
use 5.010;
use strict;
use warnings;

my $port_name = 'sdm_yout_i[1]';
open my $fh,         "tt.txt"     or die $!;
while (<$fh>)
{
        if  ($_ =~ /\.([0-9a-z_]*?) \(.*?${port_name} .*?,/) {
                print '$port_name = ' ; say $port_name;
                print 'cell name = ' ; say $1;
        }
        
}