Hi fellow monks,

What is my code doing that warrants a warning, and how do I fix it? Thanks. Abridged warnings:

Use of uninitialized value in length at ./jumble.pl line 34, <DATA> li
+ne 1.
Use of uninitialized value in split at ./jumble.pl line 34, <DATA> lin
+e 1.
Use of uninitialized value in concatenation (.) or string at ./jumble.
+pl line 36, <DATA> line 1.
Use of uninitialized value in split at ./jumble.pl line 33, <DATA> lin
+e 1.

[download]

The offending code

use strict;
use warnings;
use List::Util 'shuffle';

while (<DATA>) {
    my @newline = split(/\b/);
    for my $word (@newline) {
        my $first = "";
        my $rem = "";
        my $middle = "";
        my $last = "";
        ($first, $rem)  = split /(?<=\b\w)/, $word;
        ($middle, $last) = split /(?=(\w'\w+|\w)$)/, $rem;
        ((length $middle) == 2) ? $middle = reverse $middle :
        ($middle = join "", shuffle(split //, $middle));
         print "$first$middle$last";
    }
}

[download]
__END__
I couldn't believe that I was actually understanding what I was readin
+g.
The phenomenal power of the human mind, according to research at Cambr
+idge University,
suggests that it doesn't matter in what order the letters in a word ar
+e, as long as
the first and last letters are in the right place. The rest can be a t
+otal mess,
and you can still read it without a problem. This is because the human
+ mind does
not read every letter by itself, but the word as a whole. Amazing, huh
+? Yeah,
and I always thought spelling was important!
Check apostrope and punctuation: Jame's, They're, we'll they'd.

[download]

And here's the output, with warnings off: I cdolun't beievle taht I was aalulcty uedsnadnnitrg waht I was rdaenig. The peeaonhmnl peowr of the hmuan mnid, adcircnog to rerecash at Cibmdarge Uteirsvniy, ssugetgs taht it dosen't mettar in waht odrer the lterets in a wrod are, as lnog as the fisrt and lsat ltteres are in the rghit pcale. The rset can be a toatl mses, and you can siltl raed it woihtut a pboerlm. Tihs is bceusae the hmuan mnid deos not raed eervy lteetr by iseltf, but the wrod as a wlhoe. Ainzamg, huh? Yaeh, and I ayawls tguhhot splileng was intpaormt! Cchek asoptorpe and puttiunoacn: Jmae's, Tehy're, we'll tehy'd.

In reply to unititialized value warning by wrinkles

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