foreach my $chars (split(//,$input_string)) {
    $hexchars .= sprintf "%x", ord($chars);
}

[download]

Be aware that the format %x will cause you problems if your string contains characters with ordinals in the range 0x00 through 0x0f. Consider the following code where the string is terminated with CRLF.

$ perl -le '
$str = qq{test\r\n};
$wrong = join q{}, map { sprintf q{%x}, ord } split m{}, $str;
print $wrong;
$right = join q{}, map { sprintf q{%02x}, ord } split m{}, $str;
print $right;'
74657374da
746573740d0a

[download]

You can see that %x will use a variable width depending on the value to be formatted and so, for single digit values, doesn't show a leading zero. Conversely, %02x does because it is specifying a width of 2 characters, padding with leading zeros as necessary.

I hope this is of interest.

Cheers,

JohnGG

In reply to Re: Process a set num of characters at a time by johngg
in thread Process a set num of characters at a time by learningperl01

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.