【正则表达式】正则表达式应用-蒲公英云

【正则表达式】正则表达式应用

JavaScript表单验证

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>Insert title here</title> </head> <body> <form action="#" method="post" id="frmInfo"> <div id="err" style="color: red"></div> <div> 姓名：<input id="name" name="name" /> </div> <div> 身份证：<input id="idno" name="idno" /> </div> <div> <input type="submit" /> </div> </form> <script type="text/javascript"> document.getElementById("frmInfo").onsubmit = function() { //在JS中定义正则表达式对象只需要在/正则表达式/ var regex1 = /^[\u4e00-\u9fa5]{2,8}$/; //全字匹配2-8个中文字符 var regex2 = /^[1234568]\d{16}[0-9xX]$/; var name = document.getElementById("name").value; var idno = document.getElementById("idno").value; if (regex1.test(name) == false) { //利用正则校验数据，true代表匹配成功，false代表匹配失败 document.getElementById("err").innerHTML = "无效姓名"; return false; //不提交表单数据 }else if(regex2.test(idno) == false) { document.getElementById("err").innerHTML = "无效身份证号"; return false; }else { alert("验证通过，准备提交"); return true; } } </script> </body> </html>

Java中Web页面信息提取

提取Web页面中的城市中文名和英文名

Web页面

<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>国际主要城市</title> </head> <body> <h1>国际主要城市</h1> <ul> <li>纽约NewYork</li> <li>伦敦London</li> <li>东京Tokyo</li> <li>巴黎Paris</li> <li>香港HongKong</li> <li>新加坡Singapore</li> <li>悉尼Sydney</li> <li>米兰Milano</li> <li>上海Shanghai</li> <li>北京Beijing</li> <li>马德里Madrid</li> <li>莫斯科Moscow</li> <li>首尔Seoul</li> <li>曼谷Bangkok</li> <li>多伦多Toronto</li> <li>布鲁塞尔Brussels</li> <li>芝加哥Chicago</li> <li>吉隆坡KualaLumpur</li> </ul> </body> </html>

信息提取

package com.imooc.regex; import java.io.BufferedReader; import java.io.FileInputStream; import java.io.FileNotFoundException; import java.io.InputStreamReader; import java.util.regex.Matcher; import java.util.regex.Pattern; public class RegexSample { public static void main(String[] args) { StringBuilder content = new StringBuilder(); try { FileInputStream fis = new FileInputStream("D:/workspace/regex/WebContent/sample.html"); //原始的文件输入流，擅长处理二进制数据 InputStreamReader isr = new InputStreamReader(fis,"UTF-8"); //转换为可读的字符串流 BufferedReader bufferedReader = new BufferedReader(isr); //从缓冲流读取，提高读取效率 String lineText = ""; while((lineText = bufferedReader.readLine()) != null) { // System.out.println(lineText); content.append(lineText + "\n"); } bufferedReader.close(); System.out.println(content); } catch (Exception e) { // TODO Auto-generated catch block e.printStackTrace(); } //1.创建正则表达式对象 Pattern p = Pattern.compile("<li>([\\u4e00-\\u9fa5]{2,10})([a-zA-Z]+)</li>"); //2.匹配正则表达式 Matcher m = p.matcher(content); //3.查找匹配的结果 while(m.find()) { // System.out.println(m.group(0)); //完整匹配信息 String chs = m.group(1); //分组1 String eng = m.group(2); //分组2 System.out.println(chs + "-" + eng); } } }