Beefy Boxes and Bandwidth Generously Provided by pair Networks
Pathologically Eclectic Rubbish Lister
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Now suppose i need to make a generic code that just searched for the keywords "publications" and "interests" within a given page, how do i reform the code.

That's no moon, that's a space station -- Obiwan Kenobi.

To do text extraction based on known pattern is easy if you know what the section start and finish look like in general. However you are looking for a generic algorithm on logical text extraction, you need to build a text-classification/pattern-recognition engine, and that's going to be very very difficult. Difficult, but not impossible. But that's way beyond me, besides I don't want to lose too many brain cells over this. ;-)

I will only cover the easy way, ie, (deterministic) text extraction based on a set of known patterns...
use strict; use warnings; use Data::Dumper; # build a hash of known patterns for each known web site my %patterns = ( 'www.foo.com' => { start => "<h3><font[^>]*><b><!--KEY--></b>", finish => "(?<!</font>\n)<br>", }, 'www.bar.com' => { start => "...", finish => "...", }, ); my $html = do { local $/; <DATA> }; print ExtractSection($html, 'www.foo.com', 'Section 2'), "\n\n"; print ExtractSection($html, 'www.foo.com', 'Section 1'), "\n\n"; print ExtractSection($html, 'www.foo.com', 'Section 3'), "\n\n"; # ----------------------------------------------------- sub ExtractSection { my ($html, $site, $section) = @_; my $ps = $patterns{$site}->{start}; my $pf = $patterns{$site}->{finish}; $ps =~ s/<!--KEY-->/$section/; $pf =~ s/<!--KEY-->/$section/; my ($text) = $html =~ /($ps.*?$pf)/sm; return $text; } __DATA__ <HTML> <h3><font size=+1><b>Section 1</b></font> <br> <li>Item 1 <li>Item 2 <li>Item 3 <br> <h3><font size=+1><b>Section 2</b></font> <br> <li>Item 4 <li>Item 5 <li>Item 6 <br> <h3><font size=+1><b>Section 3</b></font> <br> <li>Item 7 <li>Item 8 <li>Item 9 <br> </HTML>

And the output -
<h3><font size=+1><b>Section 2</b></font> <br> <li>Item 4 <li>Item 5 <li>Item 6 <br> <h3><font size=+1><b>Section 1</b></font> <br> <li>Item 1 <li>Item 2 <li>Item 3 <br> <h3><font size=+1><b>Section 3</b></font> <br> <li>Item 7 <li>Item 8 <li>Item 9 <br>


In reply to Re: Re: Re: text extract by Roger
in thread text extract by shu

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or or How to display code and escape characters are good places to start.
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 browsing the Monastery: (7)
As of 2021-06-21 11:23 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    What does the "s" stand for in "perls"? (Whence perls)












    Results (98 votes). Check out past polls.

    Notices?