I am assuming you want all and in this case I am just printing them. You could 
push on to an array or create a hash:

#!perl -w
my $in = 0;

while ( <DATA> ) {
   chomp;
   $in++;
   while ( /\s((\d{1,3}\.){3}\d{1,3})/g ) {
      printf "ln: %5d  $1\n", $in;
    }
   print "\n";
 }
__DATA__
15:46:25.967683 194.244.46.38.1412 > 207.88.221.53.119: . ack 1115 win 8760 (DF)
15:46:26.600505 194.244.46.38.1412 > 207.88.221.53.119: P 15:21(6) ack 1115 win 8760 
(DF)
15:46:26.600972 194.244.46.38.1412 > 207.88.221.53.119: F 21:21(0) ack 1115 win 8760 
(DF)
15:46:26.604361 194.244.46.38.1412 > 207.88.221.53.119: R 14048899:14048899(0) win 0 
(DF)
15:46:26.822313 207.88.221.53.119 > 194.244.46.38.1412: . ack 22 win 24820 (DF)

^--End of code

Output:

ln:     1  194.244.46.38
ln:     1  207.88.221.53

ln:     2  194.244.46.38
ln:     2  207.88.221.53

ln:     3  194.244.46.38
ln:     3  207.88.221.53

ln:     4  194.244.46.38
ln:     4  207.88.221.53

ln:     5  207.88.221.53
ln:     5  194.244.46.38


Wags ;)
-----Original Message-----
From: walter valenti [mailto:[EMAIL PROTECTED]]
Sent: Friday, September 21, 2001 07:53
To: [EMAIL PROTECTED]
Subject: reg expr


How i can write a reg. expr for find the IP address in log file like:

15:46:25.967683 194.244.46.38.1412 > 207.88.221.53.119: . ack 1115 win
8760 (DF)
15:46:26.600505 194.244.46.38.1412 > 207.88.221.53.119: P 15:21(6) ack
1115 win 8760 (DF)
15:46:26.600972 194.244.46.38.1412 > 207.88.221.53.119: F 21:21(0) ack
1115 win 8760 (DF)
15:46:26.604361 194.244.46.38.1412 > 207.88.221.53.119: R
14048899:14048899(0) win 0 (DF)
15:46:26.822313 207.88.221.53.119 > 194.244.46.38.1412: . ack 22 win
24820 (DF)


P.S. A IP address is:   x.y.z.w  where x, y, z, w are numbers of one,
two, three ciphers !!!
The 5th number visible in the log file is the port.
EX:
194.244.46.38 is IP address 1412 is the port

Thanks

    Walter


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