ne=fg,peer ip address=10.238.121.8,type=.......
取peer ip address=和逗号之间的ip
------解决思路----------------------
java的，包括判断合法性，修改一点点C#就一样用
http://blog.codinghonor.com/2015/03/03/ip-and-prime-regular-expression-match/
------解决思路----------------------
\d{1,3}(?:\.\d{1,3}){3}