求个正则取ip

[liujiahaol12345]

ne=fg,peer ip address=10.238.121.8,type=.......
取peer ip address=和逗号之间的ip

[ajianchina]

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/

[娃都会打酱油了]

\d{1,3}(?:\.\d{1,3}){3}