正規表現で日付を検証する方法
日付形式（dd / mm / yyyy）正規表現パターン
(0?[1-9]|[12][0-9]|3[01])/(0?[1-9]|1[012])/((19|20)\\d\\d)
説明
( #start of group #1
0?[1-9] # 01-09 or 1-9
| # ..or
[12][0-9] # 10-19 or 20-29
| # ..or
3[01] # 30, 31
) #end of group #1
/ # follow by a "/"
( # start of group #2
0?[1-9] # 01-09 or 1-9
| # ..or
1[012] # 10,11,12
) # end of group #2
/ # follow by a "/"
( # start of group #3
(19|20)\\d\\d # 19[0-9][0-9] or 20[0-9][0-9]
) # end of group #3
上記の正規表現は、「dd / mm / yyyy」の日付形式を検証するために使用されます。必要に応じて簡単にカスタマイズできます。 ただし、うるう年、月の30日または31日を検証するのは少し難しいため、以下のような基本的なロジックが必要になる場合があります。
P.S Do let me know, if you know the regular expression which can check the leap and days of a month.
Java正規表現の例
package com.example.regex;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class DateValidator{
private Pattern pattern;
private Matcher matcher;
private static final String DATE_PATTERN =
"(0?[1-9]|[12][0-9]|3[01])/(0?[1-9]|1[012])/((19|20)\\d\\d)";
public DateValidator(){
pattern = Pattern.compile(DATE_PATTERN);
}
/**
* Validate date format with regular expression
* @param date date address for validation
* @return true valid date fromat, false invalid date format
*/
public boolean validate(final String date){
matcher = pattern.matcher(date);
if(matcher.matches()){
matcher.reset();
if(matcher.find()){
String day = matcher.group(1);
String month = matcher.group(2);
int year = Integer.parseInt(matcher.group(3));
if (day.equals("31") &&
(month.equals("4") || month .equals("6") || month.equals("9") ||
month.equals("11") || month.equals("04") || month .equals("06") ||
month.equals("09"))) {
return false; // only 1,3,5,7,8,10,12 has 31 days
} else if (month.equals("2") || month.equals("02")) {
//leap year
if(year % 4==0){
if(day.equals("30") || day.equals("31")){
return false;
}else{
return true;
}
}else{
if(day.equals("29")||day.equals("30")||day.equals("31")){
return false;
}else{
return true;
}
}
}else{
return true;
}
}else{
return false;
}
}else{
return false;
}
}
}
一致する日付形式：
1. “1/1/2010” , “01/01/2020”
2. “31/1/2010”, “31/01/2020”
3. “29/2/2008”, “29/02/2008”
4. “28/2/2009”, “28/02/2009”
5. “31/3/2010”, “31/03/2010”
6. “30/4/2010”, “30/04/2010”
7. “31/5/2010”, “31/05/2010”
8. “30/6/2010”, “30/06/2010”
9. “31/7/2010”, “31/07/2010”
10. “31/8/2010”, “31/08/2010”
11. “30/9/2010”, “30/09/2010”
12. “31/10/2010”, “31/10/2010”
13. “30/11/2010”, “30/11/2010”
14. “31/12/2010”, “31/12/2010”
日付形式が一致しません：
1. “32/1/2010” , “32/01/2020” – day is out of range [1-31]
2. “1/13/2010”, “01/01/1820” – month is out of range [1-12], year is out of range [1900-2999]
3. “29/2/2007”, “29/02/2007” – 2007 is not leap year, only has 28 days
4. “30/2/2008”, “31/02/2008” – leap year in February has 29 days only
5. “29/a/2008”, “a/02/2008” – month is invalid, day is invalid
6. “333/2/2008”, “29/02/200a” – day is invalid, year is invalid
7. “31/4/20100”, “31/04/2010” – April has 30 days only
8. “31/6/2010”, “31/06/2010” -June has 30 days only
9. “31/9/2010”, “31/09/2010” – September has 30 days only
10. “31/11/2010” – November has 30 days only
単体テスト-DateValidatorTest
package com.example.regex;
import org.testng.Assert;
import org.testng.annotations.*;
/**
* Date format dd/mm/yyyy validator Testing
* @author example
*
*/
public class DateValidatorTest {
private DateValidator dateValidator;
@BeforeClass
public void initData(){
dateValidator = new DateValidator();
}
@DataProvider
public Object[][] ValidDateProvider() {
return new Object[][]{
new Object[] {"1/1/2010"}, new Object[] {"01/01/2020"},
new Object[] {"31/1/2010"}, new Object[] {"31/01/2020"},
new Object[] {"29/2/2008"}, new Object[] {"29/02/2008"},
new Object[] {"28/2/2009"}, new Object[] {"28/02/2009"},
new Object[] {"31/3/2010"}, new Object[] {"31/03/2010"},
new Object[] {"30/4/2010"}, new Object[] {"30/04/2010"},
new Object[] {"31/5/2010"}, new Object[] {"31/05/2010"},
new Object[] {"30/6/2010"}, new Object[] {"30/06/2010"},
new Object[] {"31/7/2010"}, new Object[] {"31/07/2010"},
new Object[] {"31/8/2010"}, new Object[] {"31/08/2010"},
new Object[] {"30/9/2010"}, new Object[] {"30/09/2010"},
new Object[] {"31/10/2010"}, new Object[] {"31/10/2010"},
new Object[] {"30/11/2010"}, new Object[] {"30/11/2010"},
new Object[] {"31/12/2010"}, new Object[] {"31/12/2010"}
};
}
@DataProvider
public Object[][] InvalidDateProvider() {
return new Object[][]{
new Object[] {"32/1/2010"}, new Object[] {"32/01/2020"},
new Object[] {"1/13/2010"}, new Object[] {"01/01/1820"},
new Object[] {"29/2/2007"}, new Object[] {"29/02/2007"},
new Object[] {"30/2/2008"}, new Object[] {"31/02/2008"},
new Object[] {"29/a/2008"}, new Object[] {"a/02/2008"},
new Object[] {"333/2/2008"}, new Object[] {"29/02/200a"},
new Object[] {"31/4/2010"}, new Object[] {"31/04/2010"},
new Object[] {"31/6/2010"}, new Object[] {"31/06/2010"},
new Object[] {"31/9/2010"}, new Object[] {"31/09/2010"},
new Object[] {"31/11/2010"}
};
}
@Test(dataProvider = "ValidDateProvider")
public void ValidDateTest(String date) {
boolean valid = dateValidator.validate(date);
System.out.println("Date is valid : " + date + " , " + valid);
Assert.assertEquals(true, valid);
}
@Test(dataProvider = "InvalidDateProvider",
dependsOnMethods="ValidDateTest")
public void InValidDateTest(String date) {
boolean valid = dateValidator.validate(date);
System.out.println("Date is valid : " + date + " , " + valid);
Assert.assertEquals(false, valid);
}
}
単体テスト-結果
[Parser] Running:
E:\workspace\example\temp-testng-customsuite.xml
Date is valid : 1/1/2010 , true
Date is valid : 01/01/2020 , true
Date is valid : 31/1/2010 , true
Date is valid : 31/01/2020 , true
Date is valid : 29/2/2008 , true
Date is valid : 29/02/2008 , true
Date is valid : 28/2/2009 , true
Date is valid : 28/02/2009 , true
Date is valid : 31/3/2010 , true
Date is valid : 31/03/2010 , true
Date is valid : 30/4/2010 , true
Date is valid : 30/04/2010 , true
Date is valid : 31/5/2010 , true
Date is valid : 31/05/2010 , true
Date is valid : 30/6/2010 , true
Date is valid : 30/06/2010 , true
Date is valid : 31/7/2010 , true
Date is valid : 31/07/2010 , true
Date is valid : 31/8/2010 , true
Date is valid : 31/08/2010 , true
Date is valid : 30/9/2010 , true
Date is valid : 30/09/2010 , true
Date is valid : 31/10/2010 , true
Date is valid : 31/10/2010 , true
Date is valid : 30/11/2010 , true
Date is valid : 30/11/2010 , true
Date is valid : 31/12/2010 , true
Date is valid : 31/12/2010 , true
Date is valid : 32/1/2010 , false
Date is valid : 32/01/2020 , false
Date is valid : 1/13/2010 , false
Date is valid : 01/01/1820 , false
Date is valid : 29/2/2007 , false
Date is valid : 29/02/2007 , false
Date is valid : 30/2/2008 , false
Date is valid : 31/02/2008 , false
Date is valid : 29/a/2008 , false
Date is valid : a/02/2008 , false
Date is valid : 333/2/2008 , false
Date is valid : 29/02/200a , false
Date is valid : 31/4/2010 , false
Date is valid : 31/04/2010 , false
Date is valid : 31/6/2010 , false
Date is valid : 31/06/2010 , false
Date is valid : 31/9/2010 , false
Date is valid : 31/09/2010 , false
Date is valid : 31/11/2010 , false
PASSED: ValidDateTest("1/1/2010")
PASSED: ValidDateTest("01/01/2020")
PASSED: ValidDateTest("31/1/2010")
PASSED: ValidDateTest("31/01/2020")
PASSED: ValidDateTest("29/2/2008")
PASSED: ValidDateTest("29/02/2008")
PASSED: ValidDateTest("28/2/2009")
PASSED: ValidDateTest("28/02/2009")
PASSED: ValidDateTest("31/3/2010")
PASSED: ValidDateTest("31/03/2010")
PASSED: ValidDateTest("30/4/2010")
PASSED: ValidDateTest("30/04/2010")
PASSED: ValidDateTest("31/5/2010")
PASSED: ValidDateTest("31/05/2010")
PASSED: ValidDateTest("30/6/2010")
PASSED: ValidDateTest("30/06/2010")
PASSED: ValidDateTest("31/7/2010")
PASSED: ValidDateTest("31/07/2010")
PASSED: ValidDateTest("31/8/2010")
PASSED: ValidDateTest("31/08/2010")
PASSED: ValidDateTest("30/9/2010")
PASSED: ValidDateTest("30/09/2010")
PASSED: ValidDateTest("31/10/2010")
PASSED: ValidDateTest("31/10/2010")
PASSED: ValidDateTest("30/11/2010")
PASSED: ValidDateTest("30/11/2010")
PASSED: ValidDateTest("31/12/2010")
PASSED: ValidDateTest("31/12/2010")
PASSED: InValidDateTest("32/1/2010")
PASSED: InValidDateTest("32/01/2020")
PASSED: InValidDateTest("1/13/2010")
PASSED: InValidDateTest("01/01/1820")
PASSED: InValidDateTest("29/2/2007")
PASSED: InValidDateTest("29/02/2007")
PASSED: InValidDateTest("30/2/2008")
PASSED: InValidDateTest("31/02/2008")
PASSED: InValidDateTest("29/a/2008")
PASSED: InValidDateTest("a/02/2008")
PASSED: InValidDateTest("333/2/2008")
PASSED: InValidDateTest("29/02/200a")
PASSED: InValidDateTest("31/4/2010")
PASSED: InValidDateTest("31/04/2010")
PASSED: InValidDateTest("31/6/2010")
PASSED: InValidDateTest("31/06/2010")
PASSED: InValidDateTest("31/9/2010")
PASSED: InValidDateTest("31/09/2010")
PASSED: InValidDateTest("31/11/2010")
===============================================
com.example.regex.DateValidatorTest
Tests run: 47, Failures: 0, Skips: 0
===============================================
===============================================
example
Total tests run: 47, Failures: 0, Skips: 0
===============================================
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