Regular expression for matching latitude longitude coordinates

Question

I m trying to create a regular expression for matching latitude longitude coordinates  For matching a double-precision number I ve used   -  d     d      and tried to combine that into a single expression      -  d     d      w   -  d     d        I expected this to match a double  a comma  perhaps some space  and another double  but it doesn t seem to work  Specifically it only works if there s NO space  not one or more  What have I done wrong

User · Answer

A complete and simple method in objective C for checking correct pattern for latitude and longitude is:

 -( BOOL )textIsValidValue:(NSString*) searchedString
{
    NSRange   searchedRange = NSMakeRange(0, [searchedString length]);
    NSError  *error = nil;
    NSString *pattern = @"^[-+]?([1-8]?\\d(\\.\\d+)?|90(\\.0+)?),\\s*[-+]?(180(\\.0+)?|((1[0-7]\\d)|([1-9]?\\d))(\\.\\d+)?)$";
    NSRegularExpression* regex = [NSRegularExpression regularExpressionWithPattern: pattern options:0 error:&error];
    NSTextCheckingResult *match = [regex firstMatchInString:searchedString options:0 range: searchedRange];
    return match ? YES : NO;
}

where searchedString is the input that user would enter in the respective textfield.

User · Answer

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

User · Answer

Whitespace is  s  not  w    -  d     d      s  -  d     d        See if this works

User · Answer

Try this          -       d  1 2          d         s     -       d  1 3         d             Check it out at   http   regexpal com   Paste the expression in the top box  then put things like this in the bottom box    80 0123  -34 034   80 0123   80 a   980 13  40   99 000  122 000    Regex breakdown                          The string must start this way  there can t be anything before                           An opening parentheses  escaped with a backslash         -                An optional minus  or an optional plus         d  1 2          1 or 2 digits  0-9                          Start of a sub-pattern                         Start of a sub-pattern                         A dot  escaped with a backslash                 d        One or more digits  0-9                          A comma                         End of a sub-pattern                         End of a sub-pattern        s                Zero or more spaces                         Start of a sub-pattern            -            An optional minus  or an optional plus              d  1 3      1 to 3 digits  0-9                          Start of a pattern                         A dot  escaped with a backslash                 d        One or more digits  0-9                          End of an optional pattern                         A closing parenthesis  escaped with a backkslash                          End of a pattern                        The string must end this way  there can t be anything after     Now  what this does NOT do is restrict itself to this range    -90 to  90  and -180 to  180    Instead  it simple restricts itself to this range    -99 to  99  -199 to  199     But the point is mainly just to break down each piece of the expression

User · Answer

-  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

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Python   Latitude  result   re match     -    90   0       0-8   0-9      0-9         -90 00001    Longitude  result   re match     -    180   0       1 0-7  0-9     0-9  0 2       0-9         -0 0000    Latitude should fail in the example

User · Answer

macro-ferrari I did find a way to shorten it  and without look aheads in the light of all recent talks about regex engines  const LAT RE       -     1-8   0-9      0-9  1 6    90   0 1 6               const LONG RE       -      1-9   0-9  1 0-7  0-9      0-9  1 6     180   0 1 6

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Ruby  Longitude -179 99999999  180     -    1 0-7   1-9    d      d 1 8    180     0 1 8           longitude to s   Latitude -89 99999999  90     -  1-8   d      d 1 8    90     0 1 8           latitude to s

User · Answer

Here is a more strict version      -    d 1 2     d    s   -    d 1 3     d       Latitude   -90 --  90 Longitude   -180 --  180

User · Answer

I believe you re using  w  word character  where you ought to be using  s  whitespace    Word characters typically consist of  A-Za-z0-9    so that excludes your space  which then further fails to match on the optional minus sign or a digit

User · Answer

Try this      lt   d   -       1-8   d      d    90     0       s   -      180     0          1 0-7  d      1-9   d        d         d

User · Answer

PHP  Here is the PHP s version  input values are   latitude and  longitude     latitude pattern       A  -     90     0 1 18     d     lt  9   d     d 1 18   z x    longitude pattern      A  -     180     0 1 18       1 0-7  d  d 1 2     d 1 18   z x   if  preg match  latitude pattern   latitude   amp  amp  preg match  longitude pattern   longitude          Valid coordinates

User · Answer

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

User · Answer

This would work for format like this  31   37 4  E    -   d 1 2           d 1 2     d 1 2      x27     w

User · Answer

You can try this       var latExp          -   8 0-5      0-7   0-9          0-9  1 20       var lngExp          -   0  8-9  0-9   180   0-1   0-7   0-9          0-9  1 20

User · Answer

Try this     -      0-8   d   d       d    90    0       s   -     1 0-7   d      d      180    0        d  d      d        d      d

User · Answer

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  lt   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  gt   -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  lt   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  lt   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  gt   -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  lt   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

[regex] Regular expression for matching latitude/longitude coordinates?

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