Oh, okay... fair enough.

But just to clarify... this is the output I am currently getting: 

Host:hosta-sel-kr-1 Test:testa
Host:hostb-sel-kr-1 Test:testb
Host:hostc-sel-kr-1,my-domain,com Test:testa
Host:hostd-sel-kr-1,my-domain,com Test:testc
Host:hoste-sel-kr-1 Test:testxyz
Host:hosta-mel-au-1 Test:testabc
Host:hosta-mel-au-1 Test:testdef
Host:hostxyz Test:testabc
Host:someotherhost Test:someothertest

[download]
and this is the output I want: 
Host:hosta-sel-kr-1 Test:testa
Host:hostb-sel-kr-1 Test:testb
Host:hostc-sel-kr-1.my-domain.com Test:testa
Host:hostd-sel-kr-1.my-domain.com Test:testc
Host:hoste-sel-kr-1 Test:testxyz
Host:hosta-mel-au-1 Test:testabc
Host:hosta-mel-au-1 Test:testdef
Host:hostxyz Test:testabc
Host:someotherhost Test:someothertest

[download]
(Notice that the only difference is that the commas in the com domain names have been replaced with periods)

So your solution doesn't actually give the desired result.

In reply to Re^2: Regex: Capturing and optionally replacing by McDarren
in thread Regex: Capturing and optionally replacing by McDarren

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