正则表达式例子
package com.wepull.regex;import java.util.regex.Matcher;import java.util.regex.Pattern;public class Demo1 {/** * 判断一个字符串是否由纯数字组成 */private void fun1() {String str = "0123456789";System.out.println(str.matches("\\d+"));}private void testString() {// System.out.println("b".matches("."));//true// System.out.println("aa".matches("aa")) ;// System.out.println("aaaa".matches("a*")) ; //true// System.out.println("aaaa".matches("a+")) ;//true// System.out.println("".matches("a*"));//true// System.out.println("aaaa".matches("a?"));//false// System.out.println("".matches("a?"));///true// System.out.println("a".matches("a?"));// System.out.println("3366572".matches("\\d{3,10}"));//trueSystem.out.println("192.168.0.220".matches("\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}"));//// System.out.println("192".matches("[0-2][0-9][0-9]"));}/** * 范围 */private static void fun5() {// System.out.println( "e".matches("[abc]"));// System.out.println( "e".matches("[^abc]"));// System.out.println( "A".matches("[a-zA-Z]"));// System.out.println( "A".matches("[a-z]|[A-Z]"));// System.out.println( "A".matches("[a-z[A-Z]]"));// System.out.println( "B".matches("[A-Z&&[ABC]]"));}private void testEmail() {String email = "wlt_5186@qq.gov";String regex = "\\w+@\\w+\\.(com|cn|gov|net)";System.out.println(email.matches(regex));}private void testEmail2() {String email = "wlt_5186@qq.gov";String regex = "(\\w+)@(\\w+)\\.(com|cn|gov|net)";Pattern p = Pattern.compile(regex);Matcher m = p.matcher(email);if (m.matches()) {System.out.println("第0组" + m.group(0));System.out.println("第1组" + m.group(1));System.out.println(m.start(1) + " " + m.end(1));System.out.println("第2组" + m.group(2));System.out.println(m.start(2) + " " + m.end(2));System.out.println("第3组" + m.group(3));}}private void testFind() {String s = "下面是公司电话号码086-027-87591191-" + "你能使用正则表达式分别找出区号和电话吗？";String regex = "\\d{3,8}";Pattern p = Pattern.compile(regex);Matcher m = p.matcher(s);while (m.find()) {System.out.println(m.group());}}public static void main(String[] args) {// new Demo1().fun1();Demo1 d = new Demo1();// d.fun5();// d.testEmail();// d.testEmail2();d.testFind();}}?
package com.wepull.regex;import java.util.regex.Pattern;public class TestPattern {/** * String str =“hello444java3377Lady GaGa”， * 按照数字把字符串拆分 （hello,java,lady GaGa） */private void testSplit() {String str ="hello444java3377Lady GaGa";Pattern p = Pattern.compile("\\d+");//通过compile方法 编译得到一个指定规范的正则表达式 模板对象 patternString[] strs = p.split(str);//把字符串按照指定的模式拆分for (String s : strs) {System.out.println(s);}}/** * @param args */public static void main(String[] args) {TestPattern t = new TestPattern();t.testSplit();}}?
package com.wepull.regex;import java.util.regex.Matcher;import java.util.regex.Pattern;public class TestMatcher {/** * String str =“222hello444java3377Lady GaGa”， 把字符字母都替换成 -” */public void test(){String str = "222hello444java3377Lady GaGa";String regex = "[a-zA-Z]+"; Pattern p = Pattern.compile(regex);Matcher m = p.matcher(str);//通过Pattern对象创建一个匹配器String s = m.replaceAll("-");System.out.println(s);}public static void main(String[] args) {TestMatcher t = new TestMatcher();t.test();}}?