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use strict;
use warnings;
...
        print "matched" if m/$nets[$i]/;
        }        
}

use strict;
use warnings;
...
        print "matched" if m/$var1/;
        }        
}

design_modify1.vhd has following lines of codes 

...
    GND_i : GND port map(Y => \GND\);
    
    sum_1_CO0_i : MAJ3 port map(A => a_c, B => c_c, C => b_c, Y => N_5
+);

nets.txt file has following codes...

a_c
b_c
c_c