Hiii..guyz..thanks for replying..It's not homework..please be assured..I am just a Biologist interested in Bioinformatics...so not studying in any school right now.. I am really new in Perl..but I am trying..I have wrote a code for it..bt unfortunately it just extracts the matched part..The code I wrote.. 
while( $dna=<DNA> ) {
#chomp ($dna);


if ($dna =~ /[ACGT]+/) {
 #chomp ($dna);
print  "$&\n";
  }
}

[download]
I do not know how to get the unmatched part..thanks for any help!!

In reply to Re: An interesting Perl problem to extract file content by Anonymous Monk
in thread An interesting Perl problem to extract file content by ghosh24

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