open(my $fh, '<', 'theinputfile.txt') or die "Unable to open theinputfile.txt, $!\n";
while(my $var = <$fh>) { # Reading each line one by one from theinputfile.txt into $var
 chomp($var); # chomp $var not $_ since $_ isn't used
 #change token in url query string to $var
 $urlChop[1] =~ s/MATCH/$var/; # replace with $var not $_ since $_ isn't used
# ... whatever else you need to do
}