package com.day10.Regex正则表达式;
public class Demo2Regex {
/**
* A:字符类 * [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),相当于是def * [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) * [0-9] 0到9的字符都包括 */ public static void main(String[] args) { String regex="[abc]";//[]代表单个字符 System.out.println("a".matches(regex));//true System.out.println("b".matches(regex));//true System.out.println("c".matches(regex));//true System.out.println("d".matches(regex));//false System.out.println("%".matches(regex));//false String regex1="[^abc]"; System.out.println("a".matches(regex1));//fasle System.out.println("b".matches(regex1));//false System.out.println("c".matches(regex1));//false System.out.println("d".matches(regex1));//true System.out.println("%".matches(regex1));//true System.out.println("10".matches(regex1));//false,中括号代表单个字符,10是两个字符 String regex2="[a-zA-Z]"; System.out.println("a".matches(regex2));//true System.out.println("A".matches(regex2));//true System.out.println("z".matches(regex2));//true System.out.println("Z".matches(regex2));//true System.out.println("%".matches(regex2));//false }}