Regular expression for matching latitude/longitude coordinates?

Question

This one will strictly match latitude and longitude values that fall within the correct range:

^[-+]?([1-8]?\d(\.\d+)?|90(\.0+)?),\s*[-+]?(180(\.0+)?|((1[0-7]\d)|([1-9]?\d))(\.\d+)?)$

Matches

• +90.0, -127.554334
• 45, 180
• -90, -180
• -90.000, -180.0000
• +90, +180
• 47.1231231, 179.99999999

Doesn't Match

• -90., -180.
• +90.1, -100.111
• -91, 123.456
• 045, 180

Whitespace is \s, not \w

^(-?\d+(\.\d+)?),\s*(-?\d+(\.\d+)?)$

See if this works

I am using these ones (decimal format, with 6 decimal digits):

Latitude

^(\+|-)?(?:90(?:(?:\.0{1,6})?)|(?:[0-9]|[1-8][0-9])(?:(?:\.[0-9]{1,6})?))$

Longitude

^(\+|-)?(?:180(?:(?:\.0{1,6})?)|(?:[0-9]|[1-9][0-9]|1[0-7][0-9])(?:(?:\.[0-9]{1,6})?))$

---

Here is a gist that tests both, reported here also, for ease of access. It's a Java TestNG test. You need Slf4j, Hamcrest and Lombok to run it:

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;
        }
    }
}

Actually Alix Axel, above regex is wrong in latitude, longitude ranges point of view.

Latitude measurements range from –90° to +90° Longitude measurements range from –180° to +180°

So the regex given below validates more accurately.
Also, as per my thought no one should restrict decimal point in latitude/longitude.

^([-+]?\d{1,2}([.]\d+)?),\s*([-+]?\d{1,3}([.]\d+)?)$

OR for Objective C

^([-+]?\\d{1,2}([.]\\d+)?),\\s*([-+]?\\d{1,3}([.]\\d+)?)$

^-?[0-9]{1,3}(?:\.[0-9]{1,10})?$

Regex breakdown:

^-?[0-9]{1,3}(?:\.[0-9]{1,10})?$

-? # accept negative values

^ # Start of string

[0-9]{1,3} # Match 1-3 digits (i. e. 0-999)

(?: # Try to match...

\. # a decimal point

[0-9]{1,10} # followed by one to 10 digits (i. e. 0-9999999999)

)? # ...optionally

$ # End of string