Something like: 

while(<DATA>){
 s/[0-9]+\.[0-9]+\./X.X./g;
 print $_;
}

__DATA__
10.128.99.190 10.128.100.100

1.1.1.1 2.2.2.2

3.3.3.3 4.4.4.4

100.100.100.100 200.200.200.200

[download]

If you tell me, I'll forget.
If you show me, I'll remember.
if you involve me, I'll understand.
--- Author unknown to me

In reply to Re: Patternmatching IPaddresses by 2teez
in thread Patternmatching IPaddresses by vyeddula

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