Two quick comments... :)

Remember that one 7-bit character, the space, is being used as puncuation, so there really are at most 126 characters in the alphabet.

The use of word-boundaries (\b) to match the words is rather strange here, because we're using words that don't necessarily consist of "word characters". For example, if $n and $a were 2 and 4, that regex would match ('this', '-is!', 'one+', word') in 'this-is!one+word?'.

Negative look-ahead/-behind assertions are necessary for this approach: /(?<! )[^ ]{$n,$a}(?! )/g

In reply to Re: Re^2: (Golf) Cryptographer's Tool #2 by chipmunk
in thread (Golf) Cryptographer's Tool #2 by Masem

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