If speed is your game, it's better to write s/^N+//; s/N+$// instead of using *'s. If there are no leading (or trailing) N's, it's better for the regex to fail, than the replace an empty string with an empty string.
Perl --((8:>*

In reply to Re^3: Removing Flanking "N"s in a DNA String by Perl Mouse
in thread Removing Flanking "N"s in a DNA String by monkfan

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