Please post some code. It is very hard to know what might be your problem without seeing how you are solving the problem.

Opening and closing files is very slow - one mistake people often make is to grab a string, read all 4000 files, grab another string, read all 4000 files, and so on. (1,200,000 file openings!). You can usually avoid this by reading through each file only once and saving the data you need in a hash.

How you go about reading in and saving the data depends a lot on the nature of the strings you are searching for. Are your strings whole words or sequences that can be found in the middle of words and/or spread across several words?

Best, beth

In reply to Re: Searching multiple expressions in multiple Files by ELISHEVA
in thread Searching multiple expressions in multiple Files by technoz

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.