Constructing a regex
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am new to regex, so am having a hard time compiling my own pattern.

Basically am reading the LogCat from my android phone and am trying to break this string into pieces to be able to display it in TextView 

This is the actually string am trying to token.
**"07-06 12:18:45.790: W/dalvikvm(571): TaintLog: OSNetworkSystem.write(91.121.171.39) received data with tag 0x400 data=[POST / HTTP/1.1"**

Am able to retrieve the number after "Tag" using the scanner method, but now I need to extract the IP address from the OSnetworkSystem.Write(xxx.xxx.xxx.xxx) 

Can anybody provided me some tips on what to use to be able to extra the IP address.