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| How to write a regex to validate the 24-hour time format | Regex in java |
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
*
* How to validate Time in 24 Hours format with regular expression
*
*/
public class Time24HoursValidator
{
private Pattern pattern;
private Matcher matcher;
private static final String TIME24HOURS_REGEX = "([01]?[0-9]|2[0-3]):[0-5][0-9]";
public Time24HoursValidator()
{
pattern = Pattern.compile(TIME24HOURS_REGEX);
}
public boolean validate(final String time)
{
matcher = pattern.matcher(time);
return matcher.matches();
}
}
import java.util.regex.Pattern;
/**
*
* How to validate Time in 24 Hours format with regular expression
*
*/
public class Time24HoursValidator
{
private Pattern pattern;
private Matcher matcher;
private static final String TIME24HOURS_REGEX = "([01]?[0-9]|2[0-3]):[0-5][0-9]";
public Time24HoursValidator()
{
pattern = Pattern.compile(TIME24HOURS_REGEX);
}
public boolean validate(final String time)
{
matcher = pattern.matcher(time);
return matcher.matches();
}
}
RegexDemo.java
import java.util.Arrays;
import java.util.List;
/**
*
* How to validate Time in 24 Hours format with regular expression
*
*/
public class RegexDemo
{
public static void main(String[] args)
{
List<String> validTimeList = Arrays.asList("2:00", "23:00", "14:50");
Time24HoursValidator time24HoursValidator = new Time24HoursValidator();
for (String time : validTimeList)
{
System.out.println(time + " is Valid? = "
+ time24HoursValidator.validate(time));
}
System.out.println("--------------------------------------");
List<String> inValidTimeList = Arrays.asList("24:00", "13:1", "1:9", "110:20");
for (String time : inValidTimeList)
{
System.out.println(time + " is Valid? = "
+ time24HoursValidator.validate(time));
}
}
}
import java.util.List;
/**
*
* How to validate Time in 24 Hours format with regular expression
*
*/
public class RegexDemo
{
public static void main(String[] args)
{
List<String> validTimeList = Arrays.asList("2:00", "23:00", "14:50");
Time24HoursValidator time24HoursValidator = new Time24HoursValidator();
for (String time : validTimeList)
{
System.out.println(time + " is Valid? = "
+ time24HoursValidator.validate(time));
}
System.out.println("--------------------------------------");
List<String> inValidTimeList = Arrays.asList("24:00", "13:1", "1:9", "110:20");
for (String time : inValidTimeList)
{
System.out.println(time + " is Valid? = "
+ time24HoursValidator.validate(time));
}
}
}
Output
2:00 is Valid? = true
23:00 is Valid? = true
14:50 is Valid? = true
--------------------------------------
24:00 is Valid? = false
13:1 is Valid? = false
1:9 is Valid? = false
110:20 is Valid? = false
23:00 is Valid? = true
14:50 is Valid? = true
--------------------------------------
24:00 is Valid? = false
13:1 is Valid? = false
1:9 is Valid? = false
110:20 is Valid? = false
Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/RegexDemo_24hrs.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/RegexDemo_24hrs
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/576579fab6c376d5ecd7cb5b7402b7fd1a7c4ae3/BasicJava/RegexDemo_24hrs/?at=master
See also:
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