... it always performs the join even if there is no second element.
By this, I think you mean that there is a '_' present in all cases, even if it the last (and dangling) character in the unpack-ed string.
I tried essentially the same code as jethro under ActiveState 5.8.9 and Strawberries 220.127.116.11, 18.104.22.168 and 22.214.171.124 and get no extraneous underscore.
>perl -wMstrict -le
"my $p = 'ABCDabcdABCDabcd' . pack 'V', 0x3039;
my $unp = join '_', unpack 'H32V*', $p;
$p = 'ABCDabcdABCDabcd';
$unp = join '_', unpack 'H32V*', $p;
Can you supply a short, stand-alone code example that demonstrates the effect you seek to avoid?
Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
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:
Outside of code tags, you may need to use entities for some characters:
- a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, 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, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
Link using PerlMonks shortcuts! What shortcuts can I use for linking?
See Writeup Formatting Tips and other pages linked from there for more info.
| & || & |
| < || < |
| > || > |
| [ || [ |
| ] || ] ||