An approach using split (although conceptually similar to tye's) and splitting on groups of three lines because fourteen lines necessitates a very tedious example. 

>perl -wMstrict -le
"my $s =
   qq{foo \n bar \n baz \n fee \n fie \n foe \n aa \n bb \n cc \n};
 print qq{[[$s]]};
 ;;
 my @fields = split m{ (?: [^\n]* \n){3} \K }xms, $s;
 print qq{[[$_]]} for @fields;
"
[[foo
 bar
 baz
 fee
 fie
 foe
 aa
 bb
 cc
]]
[[foo
 bar
 baz
]]
[[ fee
 fie
 foe
]]
[[ aa
 bb
 cc
]]

[download]

Update: Also tested/works in cases in which: last 'line' does not end in newline; exactly 3 lines processed; fewer than 3 lines processed; lines consist only of newlines; etc. – I think, in fact, all possible cases.

In reply to Re: Split string after 14 Line Feeds? by AnomalousMonk
in thread Split string after 14 Line Feeds? by johnfl68

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.