【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);
}
}
}
