Looking for a regular expression

[beesond001 at hawaii.rr.com]

To all,
	I'm looking for a regular expression that will fetch IP addresses from a 
file such as /var/log/messages etc.  So far, I have a start, it looks 
like this:
	$ grep "[0-9]\{2\}.[0-9]\{3\}.[0-9]\{2\}.[0-9]\{2\}" /var/log/messages  
Unfortunately, it only works for certain types of IP addresses, those 
with a form of  AA.BBB.CC.DD.  Is there a more general approach to 
grabbing IP addresses, or will I have to write several forms of the above 
regex and apply them all?  
Thanks in advance,
Ben 

 

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