For my above code spliced the 20 lines and stored in a array format. Now that's changed to add a newline character in every 20th line and stored in a scalar variable.

$new_string.="$&\n" while ($string=~ m/([^\n]+.*?\n){1,20}/gs);
print "\n$new_string";

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In reply to Re^4: Split a string at a given line number by k_manimuthu
in thread Split a string at a given line number by danj35

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