Howdy :)

I have a set of filenames that appear as follows:

hosta-sel-kr-1,my-domain,net.testa
hostb-sel-kr-1,my-domain,net.testb
hostc-sel-kr-1,my-domain,com.testa
hostd-sel-kr-1,my-domain,com.testc
hoste-sel-kr-1,my-domain,net.testxyz
hosta-mel-au-1,my-domain,net.testabc
hosta-mel-au-1,my-domain,net.testdef
hostxyz.testabc
someotherhost.someothertest
[download]

The format of each filename is:

• a hostname
• followed by an (optional) domain name
• followed by a period
• followed by a name of a test

I need to extract the hostname and the test name from each filename, however:

• If the domain name is .net, I need to drop it (Update: Just the domain name, not the whole filename)
• If the domain name is .com, I need to keep it AND replace the commas with periods.

I have written an expression that does everything except replace the commas, and this is where I am stuck.
I know I could simply post-process each file with s/,/\./;, but that's not very elegant and I'm sure it can be done within the expression.

So I have two questions:

1. How do I replace the commas within the expression?
2. Can the expression be made more efficient? (In production, this will run every minute and will process approx 6000 files on each run)

Here is the code I have so far:

#!/usr/bin/perl -w
use strict;

while (<DATA>) {
    my ($host, $test) = ($_ =~
      m/
        (                      # Start first capture
          [\w\-]+              # One or more alphanum or hyphens
          (?:                  # non-capturing lookahead
            ,my-domain,com     # Literal string
          )?                   # Make it optional
        )                      # End of first capture
          (?:                  # non-capturing lookahead
            [\w\-,]+           # One or more alpanum or hyphens
          )?                   # Make it optional
        \.                     # A literal period
        (                      # Start second capture
          [a-z]+               # One or more lowercase chars
        )                      # End second capture
     /x)
        or print "Cannot parse $_\n" and next;

    print "Host:$host Test:$test\n";
}

__DATA__
hosta-sel-kr-1,my-domain,net.testa
hostb-sel-kr-1,my-domain,net.testb
hostc-sel-kr-1,my-domain,com.testa
hostd-sel-kr-1,my-domain,com.testc
hoste-sel-kr-1,my-domain,net.testxyz
hosta-mel-au-1,my-domain,net.testabc
hosta-mel-au-1,my-domain,net.testdef
hostxyz.testabc
someotherhost.someothertest
[download]

Any advice would be greatly appreciated.
Thanks in advance,
Darren :)

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