Thanks for your help. The reason it was so confusing was the '$&' and '&&' can/were pushed together ($&&&) and it worked the same way. Now we can use the following to print the matched line and the line after the matched line. 
perl -ne '$&&&print($&,"\n",$_), /default|$/'

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Thanks again for you quick and very helpful response. J

In reply to Re^2: Obscure expression! by chopper1804
in thread Obscure expression! by chopper1804

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