Re: Why am I getting the result only from 1st substring and not from substring 2 and 3 in using the do-until loop with while loop inside it?

How can I correct the code in line 10 for while loop while (my $fm= substr ($DNA1,0,4)) {

If I'm understanding you correctly, you want to update the offset in that substr:

my $offs = 0;
while (my $fm= substr($DNA1, $offs, 4)) {
    $offs += 4;
    ...
}
[download]

for (my $offs=0; my $fm=substr($DNA1, $offs, 4); $offs+=4 ) {
    ...
}
[download]

That would give you the 3 substrings "GGCT", "CTGC" and "GCGG".

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