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Perl: Counting matches

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# 1  
Old 04-30-2012
Perl: Counting matches
Hi,
A perl newbie here so pretty sure it's something simple. Trying to figure out how to count matches with perl pattern matching. The following script opens a text data file and finds lines containing
"PORT:" and I'd like to count how many of these are found.

Any ideas?

Code:
open(LOG,"< test_small.xml") or die "Unable to open logfile:$!\n";

while(<LOG>) {

        my $line = $_;

        if ($line =~ m/^> PORTZONESHOW/.../^> */) {
                if ( $line =~ m/^PORT:/) {
                        print $line;
                }
        }
}

Output:
Code:
PORT: 0 (0)   Offline
PORT: 1 (1)   Offline
PORT: 2 (2)   Offline
PORT: 3 (3)   Offline
PORT: 4 (4)   Offline
PORT: 5 (5)   Offline
PORT: 6 (6)   F-Port    Enforcement: HARD PORT  defaultHard: 1  IFID: 0x43020012
PORT: 7 (7)   F-Port    Enforcement: HARD WWN   defaultHard: 0  IFID: 0x43020014
PORT: 8 (8)   F-Port    Enforcement: HARD WWN   defaultHard: 0  IFID: 0x43020016
PORT: 9 (9)   Offline
PORT: 10 (10)   F-Port  Enforcement: HARD PORT  defaultHard: 1  IFID: 0x4302000c
PORT: 11 (11)   F-Port  Enforcement: HARD WWN   defaultHard: 0  IFID: 0x4302000d
PORT: 12 (12)   F-Port  Enforcement: HARD WWN   defaultHard: 0  IFID: 0x4302000f
PORT: 13 (13)   Offline
PORT: 14 (14)   F-Port  Enforcement: HARD WWN   defaultHard: 0  IFID: 0x43020013
PORT: 15 (15)   F-Port  Enforcement: HARD WWN   defaultHard: 0  IFID: 0x43020015
PORT: 16 (16)   Offline
PORT: 17 (17)   E-Port
PORT: 18 (18)   Offline
PORT: 19 (19)   Offline
PORT: 20 (20)   Offline
PORT: 21 (21)   Offline
PORT: 22 (22)   Offline
PORT: 23 (23)   Offline

Last edited by hdefjunkie; 04-30-2012 at 12:42 AM..
# 2  
Old 04-30-2012
Code:
open(LOG,"< test_small.xml") or die "Unable to open logfile:$!\n";

my $count = 0; # Initialise a count variable to 0.
while(<LOG>) {
    my $line = $_;
    if ($line =~ m/^> PORTZONESHOW/../^> */) { # Did you mean 2 dots here instead of 3?
        if ( $line =~ m/^PORT:/) {
            $count++; # Increment it everytime you find a match.
            print $line;
        }
    }
}

close LOG; # Its a good practice to close file handles yourself.
print "Count: $count\n"; # Print $count

This User Gave Thanks to balajesuri For This Post:
hdefjunkie
# 3  
Old 04-30-2012
Thx... Brain fart :-)
# 4  
Old 05-03-2012
As I see you already have the answer. Let me point out a few ways you could improve your Perl code.
1)
Code:
use strict; use warnings;

These usually help avoiding some common bugs. (Not this case but in general)
2) open is better written with 3 parameters as in this code:
Code:
open(my $LOG,"<", "test_small.xml") or die ...

3) You don't need to use $_ in the while loop
Code:
while(my $line = <$LOG>) {

Last edited by Scrutinizer; 05-03-2012 at 03:48 AM.. Reason: code tags
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