Beefy Boxes and Bandwidth Generously Provided by pair Networks
Don't ask to ask, just ask
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
I am a new bie.. I have a file having 50,000 lines. I want to match a pattern. I read the whole file in an array and then match the regex. I want only the line with the first match. the code is something like :-
open( FILE, "file" ) || die ("The file not there "); #open the file with 50,000 lines (some 1MB memory) @list=<FILE>; # put this in an array. close(DICTIONARY); # close the file $regex="somebla.."; #this is the regex to be matched @match=grep(/$regex/,@list); #the above line returns an array of all lines matched # but I want only first one !! Pity don't know how to # get only that.. print $match[0]; #so I get the first match of the retrned array.. #that is poor .grep has to go through the complet list # although I need the first match only
I request the help from perl monks.. With lot of thanks!! Pandey

In reply to fastest pattern match by Anonymous Monk

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 exploiting the Monastery: (16)
    As of 2014-10-23 09:24 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      For retirement, I am banking on:










      Results (125 votes), past polls