Your expected results do not match your description - I would have expected line 4 to contain 4 x's.

It is not obvious that the longest string will be bounded by $c. Or do you mean that the longest string must be terminated at each end by $c such that, if $n == 1, then ".....x......" is not acceptable, but 'x' is?

I doubt that using a regex is the most efficient way to solve this. Is it a requirement?

Perl is Huffman encoded by design.

In reply to Re: regex finding longest string containing n of $c by GrandFather
in thread regex finding shortest string containing n of $c by xipho

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