Private IP Address Identifier in Regular Expression

Question

I\'m wondering if this is the best way to match a string that starts with a private IP address (Perl-style Regex):

(^127\\.0\\.0\\.1)|(^192\\.168)|(^10\\.)|(         


        

Answer 1

FWIW this pattern was over 10% faster using pattern.matcher:

^1((0)|(92\\.168)|(72\\.((1[6-9])|(2[0-9])|(3[0-1])))|(27))\\.