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need regex help with replace

StarkRavingCalm
User

Nov 7, 2013, 7:37 AM

Post #1 of 5 (18567 views)

need regex help with replace	Can't Post

I have a script I am trying to run to print certain data from a MS DNS Log.
See below:

I do a simple grep and then:

Code

foreach (@matches) { 
 
 my $line = $_; 
 my @array = split/\s+/, $line; 
 chomp $line; 
    
print "$array[8]\t"; print "$array[15]\n";

Problem is that column 15 has the hostnames formatted as:
(3)myhost(6)somedomain(7)com

The numbers are not always the same. I want to have a regex replace (n) with a .

What is the best way to do this and the best place in the code to put it?

Thanks!

FishMonger
Veteran / Moderator

Nov 7, 2013, 8:00 AM

Post #2 of 5 (18564 views)

Re: [StarkRavingCalm] need regex help with replace [In reply to]	Can't Post

You should fix your indentation. A 1 char indent is insufficient. You should use at least 3 and max 8 space indent. My preference is 4.

Why are you doing this?

Code

my $line = $_;

It's better to declare $line in the loop initialization.

You should chomp $line before the split statement.

The regex to cleanup $array[15] (very poor choice of var name) should be between the split and print statements.

Do not put multiple statements (e.g., those print statements) on a single line. Either put them on separate lines or do it as a single print statement.

Code

foreach my $line (@matches) { 
 
    chomp $line; 
    my @array = split /\s+/, $line; 
    $array[15] =~ s/\(\d+\)/./g; 
    print "$array[8]\t$array[15]\n"; 
 
}

If you only need a small subset of the array elements, then use an array slice on the split statement to only grab the fields you want.

Code

    my ($fld8, $fld15) = (split /\s+/, $line)[8,15]; 
    $fld15 =~ s/\(\d+\)/./g; 
    print "fld8\t$fld15\n";

StarkRavingCalm
User

Nov 7, 2013, 8:07 AM

Post #3 of 5 (18562 views)

Re: [FishMonger] need regex help with replace [In reply to]	Can't Post

That works! Thanks!!

Is there a quick and easy way to remove the trailing . ?

The question about the my $line = $_;
Was because it was from example code.

FishMonger
Veteran / Moderator

Nov 7, 2013, 8:14 AM

Post #4 of 5 (18559 views)

Re: [StarkRavingCalm] need regex help with replace [In reply to]	Can't Post

Quote

Is there a quick and easy way to remove the trailing . ?

Sure, just add another regex.

Laurent_R
Veteran / Moderator

Nov 7, 2013, 3:21 PM

Post #5 of 5 (18545 views)

Re: [StarkRavingCalm] need regex help with replace [In reply to]	Can't Post

In Reply To

Is there a quick and easy way to remove the trailing . ?

Please show a data sample. We can't guess how to do it if we don't know what it looks like in the first place.

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