Beefy Boxes and Bandwidth Generously Provided by pair Networks RobOMonk
Problems? Is your data what you think it is?
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??

update: Look at my second offering, it's better

Here's an inefficient subroutine that I've used in the past. Probably time for an overhaul
Output when called with $string, 2, 2:
4 : (hello)
2 : (world)
2 : (hi)

sub get_pattern { my ($string, $min_len, $min_num) = @_; my $str_len = length($string); my $srch_max = int($str_len/2); my %patterns; # First we find all patterns that are up to 1/2 the length of the stri +ng foreach my $len ($min_len..$srch_max) { my $eol = $str_len - $len; foreach my $ind1 (0..$eol) { my $pat = substr($file, $ind1, $len); unless ( defined($patterns{$pat}) ) { $patterns{$pat} = 0; my $index = 0; do { $index = index($file, $pat, $index); unless ($index < 0) { $index += length($pat); $patterns{$pat}++; } } while ($index >= 0); } } } # We then dump all patterns that do not occur min_num times foreach my $key (keys %patterns) { delete $patterns{$key} if ($patterns{$key} < $min_num); } # We then go through the patterns by order and remove those # that are invalidated by better patterns foreach my $key (sort { $patterns{$b} * (length($b)-1) <=> $patterns{$a} * (length($a)-1) or length($b) <=> length($a) or $a cmp $b } keys %patterns) { my $check = 0; $patterns{$key} = 0; my $index; do { $index = index($file, $key, 0); unless ($index < 0) { $check = 1; $patterns{$key}++; substr($file, $index, length($key)) = "\000"; } } while ($index >= 0); delete $patterns{$key} if ($patterns{$key} < $min_num); } foreach my $key (sort { $patterns{$b} * (length($b)-1) <=> $patterns{$a} * (length($a)-1) or length($b) <=> length($a) or $a cmp $b } keys %patterns) { (my $pat = $key) =~ s/\n/\\n/g; printf("%3d : (%s)\n", $patterns{$key}, $pat); } }

In reply to Re: Patter Finding by lemming
in thread Pattern Finding by artist

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!
  • 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, 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
  • Outside of code tags, you may need to use entities for some characters:
            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.
  • Log In?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others chilling in the Monastery: (9)
    As of 2014-04-19 13:57 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      April first is:







      Results (481 votes), past polls