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| How to write a regex to validate the 12-hour time format | Regex in java |
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
*
* How to validate Time in 12 Hours format with regular expression
*
*/
public class Time12HoursValidator
{
private Pattern pattern;
private Matcher matcher;
private static final String TIME12HOURS_REGEX = "(1[012]|[1-9]):[0-5][0-9](\\s)?(?i)(am|pm)";
public Time12HoursValidator()
{
pattern = Pattern.compile(TIME12HOURS_REGEX);
}
public boolean validate(final String time)
{
matcher = pattern.matcher(time);
return matcher.matches();
}
}
import java.util.regex.Pattern;
/**
*
* How to validate Time in 12 Hours format with regular expression
*
*/
public class Time12HoursValidator
{
private Pattern pattern;
private Matcher matcher;
private static final String TIME12HOURS_REGEX = "(1[012]|[1-9]):[0-5][0-9](\\s)?(?i)(am|pm)";
public Time12HoursValidator()
{
pattern = Pattern.compile(TIME12HOURS_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 12 Hours format with regular expression
*
*/
public class RegexDemo
{
public static void main(String[] args)
{
List<String> validTimeList = Arrays.asList("2:00 am", "2:00 AM", "12:50 pm");
Time12HoursValidator time12HoursValidator = new Time12HoursValidator();
for (String time : validTimeList)
{
System.out.println(
time + " is Valid? = " + time12HoursValidator.validate(time));
}
System.out.println("--------------------------------------");
List<String> inValidTimeList = Arrays.asList("0:00 am", "23:00 AM", "12:90 pm","11:20 GM");
for (String time : inValidTimeList)
{
System.out.println(
time + " is Valid? = " + time12HoursValidator.validate(time));
}
}
}
import java.util.List;
/**
*
* How to validate Time in 12 Hours format with regular expression
*
*/
public class RegexDemo
{
public static void main(String[] args)
{
List<String> validTimeList = Arrays.asList("2:00 am", "2:00 AM", "12:50 pm");
Time12HoursValidator time12HoursValidator = new Time12HoursValidator();
for (String time : validTimeList)
{
System.out.println(
time + " is Valid? = " + time12HoursValidator.validate(time));
}
System.out.println("--------------------------------------");
List<String> inValidTimeList = Arrays.asList("0:00 am", "23:00 AM", "12:90 pm","11:20 GM");
for (String time : inValidTimeList)
{
System.out.println(
time + " is Valid? = " + time12HoursValidator.validate(time));
}
}
}
Output
2:00 am is Valid? = true
2:00 AM is Valid? = true
12:50 pm is Valid? = true
--------------------------------------
0:00 am is Valid? = false
23:00 AM is Valid? = false
12:90 pm is Valid? = false
11:20 GM is Valid? = false
2:00 AM is Valid? = true
12:50 pm is Valid? = true
--------------------------------------
0:00 am is Valid? = false
23:00 AM is Valid? = false
12:90 pm is Valid? = false
11:20 GM is Valid? = false
Click the below link to download the code:
https://sites.google.com/site/ramj2eev1/home/javabasics/RegexDemo_time12hrs.zip?attredirects=0&d=1
Github Link:
https://github.com/ramram43210/Java/tree/master/BasicJava/RegexDemo_time12hrs
Bitbucket Link:
https://bitbucket.org/ramram43210/java/src/576579fab6c376d5ecd7cb5b7402b7fd1a7c4ae3/BasicJava/RegexDemo_time12hrs/?at=master
See also:
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