Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked
 
PerlMonks  

Comment on

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

Dear Monks I have been struggling for a while with the negative look ahead regex. I am trying extract certain excerpts from financial statements. Specifically, I would like to extract "Item 1. Business." Here is the file link http://sec.gov/Archives/edgar/data/931683/000115752309002434/a5927574.txt The way I extract the Item 1 section is using boundaries starting from "Item 1" to either "Item 1A," "Item 2", or "Item 3." Unfortunately, the regex does not extract the whole Item 1 because it matches on "Item 3" mentioned in the excerpt, specifically it stops at "discussed more thoroughly in Item 3" I have tried using negative lookahead to make it match all the way but I can't get my code to work. Here is my code.

if($data=~m/(?:Item|ITEM)[Ss]?\s?(?:\.|\-|\:|\-|\,)?\s?(?:1|I)\s?(?:\. +|\-|\:|\,|\-\-)?\s?(?:Description|DESCRIPTION|Discussion|DISCUSSION)? +\s?(?:[Oo]f|OF)?\s?(?:[Tt][Hh][Ee])?\s?(?:Our|OUR)?\s?(?:Busine\s?ss| +BUSINE\s?SS|Company|COMPANY)\s?(?:\.|\-|\:|\-\-|\,)?(.*?)(?!discussed +\s?more\s?in\s?|set\s?forth\s?in\s?|see\s?)(?:Item|ITEM)\s?(?:\.|\-|\ +:|\-\-|\,)?\s?(?:I|1A|1B|2|3)\s?(?:\.|\-|\:|\-\|\,)?/xisg)

It would be great if you can help me figure out a way to make the regex only match the real end, (beginning of item 3) not the words "item 3" inside the excerpts of "item 1." Thank you so much!


In reply to Help with negative look ahed by eversuhoshin

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 scrutinizing the Monastery: (7)
    As of 2014-07-26 06:36 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      My favorite superfluous repetitious redundant duplicative phrase is:









      Results (175 votes), past polls