java 使用正则表达式 2016年7月5日
学习
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使用正则表达式做基本判断。

一、代码实现

（1）引入java中自带的正则包

  1. import java.util.regex.Matcher;
  2. import java.util.regex.Pattern;

（2）简单匹配数字字符串长度

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package com.xie;
 
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
public class testregex {
 
public boolean testregex(String string) {
Pattern pattern = Pattern.compile("^\\d{5,12}$");
Matcher matcher = pattern.matcher(string);
if (matcher.matches()) {
return true;
}
return false;
}
public static void main(String[] args) {
testregex testregex = new testregex();
System.out.println(testregex.testregex("503822883"));
}
}

（3）简单替换字符

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package com.xie;
 
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
public class testregex {
 
public String testregexreplaceall(String string , String replacestring) {
Pattern pattern = Pattern.compile("godlikexie", Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher(string);
String result = matcher.replaceAll(replacestring);
return result;
}
 
public String testregexreplacefirst(String string , String replacestring) {
Pattern pattern = Pattern.compile("godlikexie", Pattern.CASE_INSENSITIVE);
Matcher matcher = pattern.matcher(string);
String result = matcher.replaceFirst(replacestring);
return result;
}
public static void main(String[] args) {
testregex testregex = new testregex();
System.out.println(testregex.testregexreplaceall("my name is godlikexie ! godlikexie !" , "xie"));
System.out.println(testregex.testregexreplacefirst("my name is godlikexie ! godlikexie !" , "xie"));
}
}

结果为：

my name is xie ! xie !
my name is xie ! godlikexie !

（4）简单匹配邮箱

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package com.xie;
 
import java.util.regex.Matcher;
import java.util.regex.Pattern;
 
public class testregex {
public static boolean testregexemail(String string) {
Pattern pattern = Pattern.compile("^(\\w-*\\.*)+@(\\w-?)+(\\.\\w{2,})+$");
Matcher matcher = pattern.matcher(string);
if (matcher.matches()) {
return true;
}
return false;
}
 
public static void main(String[] args) {
testregex testregex = new testregex();
System.out.println(testregex.testregexemail("503822883@qq.com"));
}
}

二、总结

总结一下。

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