最近项目中用到很多正则，所以想把正则这块给好好整理下，首先想写最近项目常用到的，后期会从基础语法开始写起。废话不多说干货。。。

//1、对 /(斜杠) 进行截取

String fileName = "data/2012/09/18/20120918.txt";

String[] ary = fileName.split("/");

System.out.println(ary[ary.length-1]);

//2、对 .(点) 进行截取

String name = "20120918.txt";

String [] strArr = name.split("\\.");

System.out.println(strArr[0]);

//3、对 \(反斜杠) 进行截取

// String fileNameBack = "data\2012\09\18\20120918.txt";

String fileNameBack = "data\\2012\\09\\18\\20120918.txt";

// String fnb = fileNameBack.replace("\\\\","\\\\");

// System.out.println(fnb);

String[] temps = fileNameBack.split("\\\\");

System.out.println(temps[temps.length-1]);

//4、对,(逗号) 、空格 进行截取

String thingName = "2915211100,2915211900,2915219010,2915219020,海洛因";

String[] thingNameArr = thingName.split(",");

System.out.println(thingNameArr[thingNameArr.length-1]);

String spaceName = "2915211100 乙醇";

String[] spaceNameArr = spaceName.split(" ");

System.out.println(spaceNameArr[spaceNameArr.length-1]);