Nice!

(Took me a bit too understand what you are doing. :)

Pity, without the need of lower limit ranges one could even try to generalize this with a recursive pattern.

update
Actually you could avoid these limits for "is string long enough" tests, by checking for a new character instead of matching (.)

Cheers Rolf
(addicted to the Perl Programming Language and ☆☆☆☆ :)
Je suis Charlie!

In reply to Re^4: Puzzle Regex: Letter Frequency Arithmetic Sequence (updated) by LanX
in thread Puzzle Regex: Letter Frequency Arithmetic Sequence by QM

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