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Java code example using regular expression to replace mobile phone number

黄舟
Release: 2017-09-19 09:54:20
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本文的主要内容是Java语言中正则表达式替换手机号的第4到第7位,实现方法十分简单,同时涉及了一些正则表达式的相关用法,需要的朋友可以参考下。

在日常生活中,我们经常会遇到将一个手机号的4-7位字符串用正则表达式替换为为星号“*”。这是出于对安全性和保护客户隐私的考虑将程序设计成这样的。下面我们就来看看具体代码。


package Test0914;
public class Mobile {
  public static void main(String[] args) {
    String mobile = "13856984571";
    mobile = mobile.replaceAll("(\\d{3})\\d{4}(\\d{4})", "$1****$2");
    System.out.println(mobile);
  }
}
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输出结果如下:


138****4571
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这只是正则表达式的一个简单用法,下面我们拓展一下其他相关用法及具体介绍。

1,简单匹配

在java中字符串可以直接使用


String.matches(regex)
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注意:正则表达式匹配的是所有的字符串

2,匹配并查找

找到字符串中符合正则表达式的subString,结合Pattern Matcher 如下实例取出尖括号中的值


String str = "abcdefefg";
String cmd = "<[^\\s]*>";
Pattern p = Pattern.compile(cmd);
Matcher m = p.matcher(str);
if(m.find()){
System.out.println(m.group());
}else{
System.out.println("not found");
}
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此时还可以查找出匹配的多个分组,需要在正则表达式中添加上括号,一个括号对应一个分组


String str="xingming:lsz,xingbie:nv";
String cmd="xingming:([a-zA-Z]*),xingbie:([a-zA-Z]*)"&#39;
Pattern p = Pattern.compile(cmd);
Matcher m = p.matcher(str);
if(m.find()){
System.out.println("姓名:"+m.group(1));
System.out.println("性别:"+m.group(2));
}else{
System.out.println("not found");
}
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3,查找并替换,占位符的使用


String str= “abcaabadwewewe”;
String str2 = str.replaceAll("([a])([a]|[d])","*$2")
str2为:abc*ab*dwewewe
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将a或d前面的a替换成*,$为正则表达式中的占位符。

总结:

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