String strs = "IP:192.168.8.216 -- [26/Feb/2001/ 10:12:12 -0500]";
String regxs = "([0-9]{1,3}\\.[0-9]{1,3})\\s\\-\\-\\s\\[([^\\]]+)\\]";（ 要使用正则表达式已有意义的符合时要用在字符钱加双反斜杠） PatternCompiler compiler = new Perl5Compiler(); Pattern pattern = compiler.compile(regxs); PatternMatcher pm = new Perl5Matcher(); if(pm.contains(strs,pattern)){ MatchResult maResult = pm.getMatch(); System.out.println(maResult.group(1)); }