Java正则表达式验证字符串
2021-04-06 16:42:32
```java
import java.util.regex.Pattern;
class App{
public static void main(String[] args){
System.out.println(Pattern.matches("^[a-zA-Z0-9]{4,6}$", "jack"));
System.out.println(Pattern.matches("^[a-zA-Z0-9]{4,6}$", "jackmary"));
}
}
```