use Getopt::Std;
getopts('hDp:f:sb:e:q:t:jl');

if($Getopt::Std::opt_f) {$sFile = $Getopt::Std::opt_f;}
if($Getopt::Std::opt_p) {$iPid  =  $Getopt::Std::opt_p;}
if($Getopt::Std::opt_q) {$sOutFile = $Getopt::Std::opt_q;}
if($Getopt::Std::opt_c) {$iStr  =  $Getopt::Std::opt_c;}

my $sAppNameString = "[c,C][m,M]";
my $sStartString = ".?[DWEM]";
my $sAppPidString = ".*\\s+$sAppNameString:(\\d+\\.?\\d*)\\s+.*";
my $sAppString = "$sStartString$sAppPidString";

open(HFILE, "< $sFile") or die ("Failed to open $sFile");
$hFile = *HFILE;

print ("Processing file: \"$sFile\"\n");

#Splitting the log file per pid
if ($Getopt::Std::opt_s) {
  seek($hFile,0,0);

  while (<$hFile>)
    {
        if (m/$sAppString/) {
          $iPidTmp = $1;
        }
        if(($iPid != 0) && ($iPid != $iPidTmp)) {
          next;
        }

        $hOutputFile = $hFiles{$iPidTmp};
        if($hOutputFile) {
          print $hOutputFile "$_";
        }else{
          print ("PID = $iPidTmp\n");
          open( HPIDFILE.$iPidTmp, ">$sOutFile.$iPidTmp" )
                or die ("Failed to open $sOutputFile.$iPidTmp");
          $hFiles{$iPidTmp} = *HPIDFILE.$iPidTmp;
          $hOutputFile = $hFiles{$iPidTmp};
          print $hOutputFile "$_";
        }
    }
}
[download]

Oww, my eyes! x-{

On the page linked by prasadbabu, after going through 3 more clicks (Perl Monks Site FAQ - PerlMonks FAQ - "Posting on PerlMonks"), you will see the links about how to format your post and choose a sensible title. Which is to say ...

Please add code tags: <c> before the start of your code on its own line, and </c> after the end of the tag on its own line. And, please change the title of your post to "Searching for a number in a file" or similar.