I need to do it using a regexp instead of unpack('A6 A5',$chunk_of_data) because the later is soooo slow...

The regex engine will not be quicker than unpack.

Your perceived problem with the performance of unpack is probably because you are calling it for each chunk rather than unpacking all the chunks in one go:

my @bits = unpack '(A6A5)*', $all_the_data;

[download]

This is much faster than unpacking each 11 byte chunk individually.

eg:

$data = 'AAAAAABBBBB' x 10;;

@bits = unpack '(A6A5)*', $data;;

print for @bits;;
AAAAAA
BBBBB
AAAAAA
BBBBB
AAAAAA
BBBBB
AAAAAA
BBBBB
AAAAAA
BBBBB
AAAAAA
BBBBB
AAAAAA
BBBBB
AAAAAA
BBBBB
AAAAAA
BBBBB
AAAAAA
BBBBB

[download]
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.

In reply to Re: Splitting into variables columned data without delimiters with a regexp ? by BrowserUk
in thread Splitting into variables columned data without delimiters with a regexp ? by gerleu

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.