CODEWITHSUNDEEP
javascriptregex
Stranded Kid
Stranded Kid

Reputation: 1395

Regex checking lat/lon in JavaScript

I'm such a newb in regex, but still...
I based my test on this post.

I have this simple regex : 

^-?([1]?[1-7][1-9]|[1]?[1-8][0]|[1-9]?[0-9])\.{1}\d{1,6}

In Debuggex, if I test it with 88.5 for example, it matches.

In my JS file, I have : 

var lonRegex = new RegExp("^-?([1-8]?[1-9]|[1-9]0)\.{1}\d{1,6}");
var check = lonRegex.test(88.5); // hardcoded for demo
console.log(check) // output false

I can't guess why it's always returning me false, whatever the value is a number or a string like "88.5".

Upvotes: 1

Views: 198

Answers (1)

lxe
lxe

Reputation: 7589

You will need to escape some characters when creating a RegExp object from a string. From MDN:

When using the constructor function, the normal string escape rules (preceding special characters with \ when included in a string) are necessary.

In your case, this will work (note the double \ for \d and .):

var lonRegex = new RegExp("^-?([1-8]?[1-9]|[1-9]0)\\.{1}\\d{1,6}");
var check = lonRegex.test(88.5); // hardcoded for demo
console.log(check) // output true

Upvotes: 1

Related Questions