How do I... Validate longtude and latitude input fields to ensure correct format is inputed

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Im Looking to validate longtude and latitude input fields to ensure correct format is inputed

Inputs that must match

27⁰33,04.24'' S 28⁰50,24.18'' E

What I have tried:

Regex regex = new Regex(@"^[-+]?([1-8]?\d(\.\d+)?|90(\.0+)?),\s*[-+]?(180(\.0+)?|((1[0-7]\d)|([1-9]?\d))(\.\d+)?)$");


           if (!regex.IsMatch(latitude))
           {
               JQGrid1.ShowEditValidationMessage("Ivalid latitude");
           }

Posted 6-Aug-20 22:14pm

Member 14370529

Updated 6-Aug-20 23:46pm

v2

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Patrice T 7-Aug-20 4:18am

What is the problem with this code ?

Member 14370529 7-Aug-20 4:33am

when regex.IsMatch(latitude) == true
it still says it is invalid

Patrice T 7-Aug-20 4:41am

Use Improve question to update your question.
So that everyone can pay attention to this information.

How do you know that it matched ?
Show sample inputs that should match

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Patrice T · Answer 1 · 2020-08-06T23:46:00

Quote:
when regex.IsMatch(latitude) == true
it still says it is invalid

Because your input and regex do not match.
Your input format look weird:

Instead of
27⁰33,04.24'' S 28⁰50,24.18'' E
it should look like
27⁰33'04.24'' S 28⁰50'24.18'' E
or
27⁰33'04.24" S 28⁰50'24.18" E
and also
27⁰ S 28⁰ E
27⁰33' S 28⁰50' E
27⁰33'04" S 28⁰50'24" E
should be valid

In your regex, I don't see any place to match °, ', ", B or E
Your regex is actually matching

27.45, 28.50

You should start by listing all valid input formats, then build the regex.

Just a few interesting links to help building and debugging RegEx.
Here is a link to RegEx documentation:
perlre - perldoc.perl.org[^]
Here is links to tools to help build RegEx and debug them:
.NET Regex Tester - Regex Storm[^]
Expresso Regular Expression Tool[^]
RegExr: Learn, Build, & Test RegEx[^]
Online regex tester and debugger: PHP, PCRE, Python, Golang and JavaScript[^]
This one show you the RegEx as a nice graph which is really helpful to understand what is doing a RegEx: Debuggex: Online visual regex tester. JavaScript, Python, and PCRE.[^]
This site also show the Regex in a nice graph but can't test what match the RegEx: Regexper[^]