grep bug

[Bill Zaumen]

I was trying a pattern that would look for lines containing only
IPv4 and IPv6 addresses and as one step used grep as follows:

        grep -v '[^[:digit:]:.]'
        
This will match

        192
        192:2
        
but not
        192.3

Similarly,

        grep -v '[^[:digit:].:]'

will match

        192
        192.3
        
but not
        192:3
        
Running 

        grep -v '[^:.[:digit:]]'
        
works as expected, matching lines containing only "192", "192.3"
and "192:3".  All three patterns work as expected on Solaris using
the version of grep that comes with the system.  I found the problem
on a Red Hat 9.0 x86 system.

Regards,

Bill