Java |使用 Regex 的日期格式验证

原文:https://www . geesforgeks . org/Java-date-format-validation-use-regex/

我们使用方法将给定的正则表达式编译成一个模式。这里正则表达式是要编译的表达式。

// Java program to check if given date is
// valid or not.
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class GeeksforGeeks {

    // Returns true if d is in format
    // /dd/mm/yyyy
    public static boolean isValidDate(String d)
    {
        String regex = "^(1[0-2]|0[1-9])/(3[01]"
                       + "|[12][0-9]|0[1-9])/[0-9]{4}{content}quot;;
        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher((CharSequence)d);
        return matcher.matches();
    }

    public static void main(String args[])
    {
        System.out.println(isValidDate("10/12/2016"));
        System.out.println(isValidDate("10/02/18"));
    }
}

[输出:

```java true false

```](https://www.geeksforgeeks.org/regular-expressions-in-java/)

验证日期的更多方法:

  1. Simple date format class . We can use the parsing method of this class to verify the date.
  2. Write our own method to check whether the date is valid.

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