Java 正则表达式的简单应用.
package pack.java.thread.atm;import java.util.regex.Matcher;import java.util.regex.Pattern;public class Expression {//* + ? {n} {n,m}的意思://*代表0次到多次;//+代表1次到多次;//?代表0次到1次;//{n}代表出现n次;//{n,m}代表出现 n 到 m 次;//\d代表0-9;//\D代表非0-9;//\s代表空格;//\S代表非空格;//\w代表A-Z0-9;//\W代表非A-Z0-9;/** * 匹配字符串; */private void testMethod1(){Pattern pattern = Pattern.compile("Java.*",Pattern.CASE_INSENSITIVE);Matcher matcher = pattern.matcher("JAVA 编程语言!");boolean bool = matcher.matches();if(bool){System.out.println("匹配成功!");}else{System.out.println("匹配失败!");}}/*** * 分割字符串; */private void testMethod2(){String regx = "[,|]";String input = "Hello Java Word Java,Hello ,,My,Name,Is|Java|Sun,.";Pattern pattern = Pattern.compile(regx);String[] strs = pattern.split(input);for(int i = 0;i<strs.length;i++){//如果不是空白的时候,则输出.if(!"".equals(strs[i])){System.out.println(strs[i]);}}}/** * 替换; */private void testMethod3(){String regex = "正则表达式";Pattern pattern = Pattern.compile(regex);String input = "正则表达式 Hello Word! 正则表达式 Hello Word!";Matcher matcher = pattern.matcher(input);//替换第一个出现的位置;String result = matcher.replaceFirst("Java");//替换所有;//String result = matcher.replaceAll("Java");System.out.println(result);}/** * 根据查找,然后进行替换; */private void testMethod4(){Pattern pattern = Pattern.compile("正则表达式");Matcher matcher = pattern.matcher("正则表达式 Hello World,正则表达式 Hello World");StringBuffer sb = new StringBuffer();while (matcher.find()) {matcher.appendReplacement(sb, "Java");}matcher.appendTail(sb);System.out.println(sb.toString());}/** * 验证邮箱; */private void testMethod5(){String regex = "[\\w\\.\\-]+@[\\w\\-]+[\\.]+[\\w]+";String email = "363667565@qq.com";//Pattern.CASE_INSENSITIVE 忽略大小写;Pattern pattern = Pattern.compile(regex,Pattern.CASE_INSENSITIVE);Matcher matcher = pattern.matcher(email);if(matcher.matches()){System.out.println("是正确的邮箱!");}else{System.out.println("不是正确的邮箱!");}}/** * 去除html标记; */private void testMethod6(){Pattern pattern = Pattern.compile("<.+?>", Pattern.DOTALL);Matcher matcher = pattern.matcher("<font size='5' color = 'red'>样式</font>");//替换成空白;String result = matcher.replaceAll("");System.out.println(result);}/** * 查找html中对应的字符; */private void testMethod7(){String regex = "href="(.+?)"";Pattern pattern = Pattern.compile(regex);Matcher matcher = pattern.matcher("<a href="index.html">主页</a>");if(matcher.find()){System.out.println(matcher.group(1));}}/** * 截取https或者http url; */private void testMethod8(){String regex = "(http://|https://){1}[\\w\\.\\-/:]+";Pattern pattern = Pattern.compile(regex);Matcher matcher = pattern.matcher("http://www.baidu.com -> http://www.csdn.net");StringBuffer buffer = new StringBuffer();while (matcher.find()) {buffer.append(matcher.group());buffer.append("\r\n");}System.out.println(buffer.toString());}/** * 替换{0},{1},{2},{3}中的字符; * */private void testMethod9(){String msg = "我喜欢的游戏有:{1},{2},{3},{4},{5}这几种.!";String[] msgArray = new String[]{"泡泡堂","弹弹堂","Acrlive","卡卡跑订车","西游记"};StringBuffer sb =new StringBuffer();sb.append("我喜欢的游戏有:");for(int i = 1;i<=msgArray.length;i++){String regex ="\\{"+i+"\\}";Pattern pattern =Pattern.compile(regex);Matcher matcher= pattern.matcher(msg);if(matcher.find()){sb.append(msgArray[i-1]+",");}}sb.append("这几种.!");System.out.println(sb.toString());String str = "Java目前的发展史是由{0}年-{1}年"; String[][] object={new String[]{"\\{0\\}","1995"},new String[]{"\\{1\\}","2007"}}; System.out.println(replace(str,object)); }public static String replace(final String sourceString,Object[] object){ String temp=sourceString; for(int i=0;i<object.length;i++){ String[] result=(String[])object[i];Pattern pattern = Pattern.compile(result[0]);Matcher matcher = pattern.matcher(temp);temp=matcher.replaceAll(result[1]); }return temp; };public static void main(String[] args) {Expression expression = new Expression();expression.testMethod1();expression.testMethod2();expression.testMethod3();expression.testMethod4();expression.testMethod5();expression.testMethod6();expression.testMethod7();expression.testMethod8();expression.testMethod9();}}?