java正则学习笔记

public class Demo2_Regex {

/** * [abc] a、b 或 c（简单类）     [^abc] 任何字符，除了 a、b 或 c（否定）     [a-zA-Z] a 到 z 或 A 到 Z，两头的字母包括在内（范围）     [a-d[m-p]] a 到 d 或 m 到 p：[a-dm-p]（并集）     [a-z&&[def]] d、e 或 f（交集）     [a-z&&[^bc]] a 到 z，除了 b 和 c：[ad-z]（减去）     [a-z&&[^m-p]] a 到 z，而非 m 到 p：[a-lq-z]（减去）  */public static void main(String[] args) {    //demo1();    //demo2();    //demo3();    //demo4();    //demo5();    //demo6();    String regex = "[a-z&&[^m-p]]";    System.out.println("m".matches(regex));    System.out.println("a".matches(regex));    System.out.println("z".matches(regex));    System.out.println("n".matches(regex));}private static void demo6() {    String regex = "[a-z&&[^bc]]";    System.out.println("a".matches(regex));    System.out.println("b".matches(regex));    System.out.println("1".matches(regex));}private static void demo5() {    String regex = "[a-z&&[def]]";                      //取交集    System.out.println("a".matches(regex));    System.out.println("d".matches(regex));}private static void demo4() {    String regex = "[a-d[m-p]]";    System.out.println("a".matches(regex));    System.out.println("m".matches(regex));    System.out.println("n".matches(regex));}private static void demo3() {    String regex = "[a-zA-Z]";    System.out.println("a".matches(regex));    System.out.println("A".matches(regex));    System.out.println("z".matches(regex));    System.out.println("Z".matches(regex));    System.out.println("1".matches(regex));    System.out.println("%".matches(regex));}private static void demo2() {    String regex = "[^abc]";    System.out.println("a".matches(regex));    System.out.println("b".matches(regex));    System.out.println("c".matches(regex));    System.out.println("d".matches(regex));    System.out.println("1".matches(regex));    System.out.println("%".matches(regex));    System.out.println("10".matches(regex));        //10代表1字符和0字符,不是单个字符}private static void demo1() {    String regex = "[abc]";                 //[]代表单个字符    System.out.println("a".matches(regex));    System.out.println("b".matches(regex));    System.out.println("c".matches(regex));    System.out.println("d".matches(regex));    System.out.println("1".matches(regex));    System.out.println("%".matches(regex));}

}