I was just reading the documentation on grep. I'm familiar with using grep in the Terminal simply to find matches using regular expressions. I am less familiar with how grep behaves in Perl. I just added a line of code to the script I'm working on for the letter banks, and it appears to be doing exactly what I need it to. But I think it would only work if somehow the grep were returning true or false (as opposed to returning the actual string which is a match (or non-match)). 

for (sort keys %words) {
  my @list = sort @{$words{$_}};
  next unless @list > 1; 
  next unless grep !/(.).*\1/, @list;
  print "@list\n";

[download]


I'm trying to print @list only if it contains more than one element, AND it has at least one element which contains no repeat letters. This seems to be working, but again, as I see it, the grep command must be returning true or false for it to work.

In reply to Re^5: Anagrams & Letter Banks by dominick_t
in thread Anagrams & Letter Banks by dominick_t

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.