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use strict; ... # Note: You should use '\1' rather than '$1'. $sequence =~ s/(\S{1,80})/\1\n/g; print "*",$sequence,"*\n";
*This is ... nice line *
use strict; ... my @seq = ($len > 0) ? unpack("(A80)$len A*",$sequence) : $sequence; print "*",join("\n",@seq),"*\n";