some suggest about \.

[者 测试]

$awk --version
GNU Awk 3.1.1
Copyright (C) 1989, 1991-2002 Free Software
Foundation.

$cat iplog.txt
192.168.2.123 user1
192.168.2.123 user4
192.168.2.73 user2
119/168.2.66 user6

###### note: the 4th line input error on purpose to
test the awk-script.
$cat iplog.txt | awk --re-interval '{
if($1 ~
"^[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}$") 
{print "input right!",$0;}
else {print "input wrong!",$1;}
}'

#-------------------------
I always fail to test the 4th line.
Final I found I must replace "\." with "[.]".
I hope you can set "\." equal a real dot.


Many thanks to you.



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