I ran across a blog post about an interesting word characteristic, and wondered if a regex can be written to match this (e.g., with the plan to search a dictionary file). I suspect the answer is no, without invoking the magic "code in a regex".

Unfortunately, I don't have time now to try my hand at it, but I thought I'd post it here for everyone to have a go.

Update: Possible puzzles:

1) Find the longest words where each letter used has a different frequency.
2) Find the longest words where letter frequencies are sequential (e.g., 3,4,5,6).
3) Find the longest words where letter frequencies are sequential starting from 1.

Use any dictionary you like. If you have a mahvelous dictionary, drop a link here.

-QM
--
Quantum Mechanics: The dreams stuff is made of

In reply to Puzzle Regex: Letter Frequency Arithmetic Sequence by QM

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.