Hmmm ,

The OP would like the existing IP address prefixed with i.e. not replaced by, the string 'IP_', viz: 

s/^/IP_/ for values %{ $newHosts->{ server } };

[download]
or 
$_ = q/IP_/ . $_ for values %{ $newHosts->{ server } };

[download]
A user level that continues to overstate my experience :-))

In reply to Re^2: array manipulation with string by Bloodnok
in thread array manipulation with string by santoshkumarcp

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