Latitude/Longitude regex validation test. You need TestNG, Hamcrest and Lombok to run it.

LatLongValidationTest.java

import static org.hamcrest.Matchers.*;
import static org.hamcrest.MatcherAssert.*;

import java.math.RoundingMode;
import java.text.DecimalFormat;

import lombok.extern.slf4j.Slf4j;

import org.testng.annotations.Test;

@Slf4j
public class LatLongValidationTest {

    protected static final String LATITUDE_PATTERN="^(\\+|-)?(?:90(?:(?:\\.0{1,6})?)|(?:[0-9]|[1-8][0-9])(?:(?:\\.[0-9]{1,6})?))$";
    protected static final String LONGITUDE_PATTERN="^(\\+|-)?(?:180(?:(?:\\.0{1,6})?)|(?:[0-9]|[1-9][0-9]|1[0-7][0-9])(?:(?:\\.[0-9]{1,6})?))$";
    
    @Test
    public void latitudeTest(){
        DecimalFormat df = new DecimalFormat("#.######");
        df.setRoundingMode(RoundingMode.UP);
        double step = 0.01;
        Double latitudeToTest = -90.0;
        
        while(latitudeToTest <= 90.0){
            boolean result = df.format(latitudeToTest).matches(LATITUDE_PATTERN);
            log.info("Latitude: tested {}. Result (matches regex): {}", df.format(latitudeToTest), result);
            assertThat(result, is(true));
            latitudeToTest += step;
        }
        
        latitudeToTest = -90.1;
        
        while(latitudeToTest >= -200.0){
            boolean result = df.format(latitudeToTest).matches(LATITUDE_PATTERN);
            log.info("Latitude: tested {}. Result (matches regex): {}", df.format(latitudeToTest), result);
            assertThat(result, is(false));
            latitudeToTest -= step;
        }
        
        latitudeToTest = 90.01;
        
        while(latitudeToTest <= 200.0){
            boolean result = df.format(latitudeToTest).matches(LATITUDE_PATTERN);
            log.info("Latitude: tested {}. Result (matches regex): {}", df.format(latitudeToTest), result);
            assertThat(result, is(false));
            latitudeToTest += step;
        }
    }
    
    @Test
    public void longitudeTest(){
        DecimalFormat df = new DecimalFormat("#.######");
        df.setRoundingMode(RoundingMode.UP);
        double step = 0.01;
        Double longitudeToTest = -180.0;
        
        while(longitudeToTest <= 180.0){
            boolean result = df.format(longitudeToTest).matches(LONGITUDE_PATTERN);
            log.info("Longitude: tested {}. Result (matches regex): {}", df.format(longitudeToTest), result);
            assertThat(result, is(true));
            longitudeToTest += step;
        }
        
        longitudeToTest = -180.01;
        
        while(longitudeToTest >= -300.0){
            boolean result = df.format(longitudeToTest).matches(LONGITUDE_PATTERN);
            log.info("Longitude: tested {}. Result (matches regex): {}", df.format(longitudeToTest), result);
            assertThat(result, is(false));
            longitudeToTest -= step;
        }
        
        longitudeToTest = 180.01;
        
        while(longitudeToTest <= 300.0){
            boolean result = df.format(longitudeToTest).matches(LONGITUDE_PATTERN);
            log.info("Longitude: tested {}. Result (matches regex): {}", df.format(longitudeToTest), result);
            assertThat(result, is(false));
            longitudeToTest += step;
        }
    }
}

Hi,
I'm new to regex, I could not quite understand the difference between above two
At one place it is 0{1,6} and at another place it is [0-9]{1,6}
Could you please elaborate on this
Actually I have a longitude value -83.37745046615599
where the number of decimal places is greater than 6, as per my understanding it is limited to 6, I tried [0-9]{1,15} it did not work