Check if a variable contain alphabetic character

Question

I am trying to eject every results of an array that contain alphabetic characters. For this, I use :

if(gtin.toString().length != 13 || /[a-z\-]+/ig.test(gtin) == true) {
    gtin = "null";
}

It's works for some variable… But not every time. For exemple :

CS230
C1
L3940-noir

All of this variables will still appear on the array. Do you have an idea why this doesn't work ? Thank you !

Can you explain better the results that you want or don't want in the array? — Ares, Nov 10 '17 at 12:36
It's unclear what you're asking or what results you expect to see. Please update your question with a **runnable** [mcve] demonstrating the problem, using Stack Snippets (the `[<>]` toolbar button; [here's how to do one](https://meta.stackoverflow.com/questions/358992/ive-been-told-to-do-a-runnable-example-with-stack-snippets-how-do-i-do-tha)). — T.J. Crowder, Nov 10 '17 at 12:40
Check this out: https://stackoverflow.com/questions/3532053/regular-expression-for-only-characters-a-z-a-z — Big Smile, Nov 10 '17 at 12:40

score 1 · Answer 1 · answered Nov 10 '17 at 12:49

1

You have to add digits and anchor your regex:

var test = [
    'abc',
    'CS230',
    'C1',
    'L3940-noir',
    'ab::cd'
];
console.log(test.map(function (a) {
  return a+' :'+/^[a-z0-9-]+$/ig.test(a);
}));

answered Nov 10 '17 at 12:49

Toto

89,455
62
89
125

score 1 · Answer 2 · answered Nov 10 '17 at 12:50

This really isn't an answer. It's more an illustration to that it does work.

var texts = ['CS230','C1', 'L3940-noir', '1231231231231', '/()!!!###&&&+', 'ABCDEFGHIJKLM', '0123456s78901'];

texts.forEach(function(gtin) {
          
  if(gtin.toString().length != 13 || /[a-z\-]+/ig.test(gtin) == true) {
    gtin = "null";
  }
  document.write(gtin + '<br/>');
});

Check this snippet and you'll see that all you're examples are set to null, i.e. "rejected" (which I guess is what you meant). It only lets strings that are 13 characters long, and without letters, through.

Check if a variable contain alphabetic character

2 Answers2