Regular Expression - Numbers only, no space

Question

I have the following regular expression '((?:[\d][\s]?){5}[\d])' and I’m testing her on https://regex101.com/.

My problem is this: If I have that bit 'teste 123456 teste' she will return me only '123456' what is correct. But if it is 'teste 12 345 6 teste' she returns to me '12 345 6'.

I would like to know a way for it returns only the numbers without the spaces, if there are spaces.

Answer 1

Remove everything except numbers

"teste 123456 teste".replace(/\D/g, '');   // 123456
"teste 12 345 6 teste".replace(/\D/g, ''); // 123456

Capture all that is number and space, but consider the numbers

var input = "teste 12 345 6 teste"; // string teste
var regex = /(\d+)| /g;             // regex

var matches, output = [];           // vars para processo
while (matches = regex.exec(input)) {  // captura do contudo, o exec vai capturar 
                                       // o primeiro resultado que encontrar seja 
                                       // `\d` ou ` `, quando capturar ` ` não 
                                       // haverá grupo 1, assim ao fazer o `matches[1]` 
                                       // este estará `undefined` que no filter é 
                                       // false, assim o eliminando do array.

    output.push(matches[1]);        // adiciona o grupo 1 a out
}
output.filter(function(value){
  return value;                     // limpeza do array
}).join('')                         // concatena tudo por join

Upshot : 123456

Answer 2

If it is exactly for this expression that says in the commentary, do so as it is. If you put the possible variables, which agent gets it right...

"(\b[0-9]\b)/g"

If it’s enough of the ok in the answer, if no comments which agent hits...

Answer 3

Regular expressions serve to recognize characters within a string. With them you can also obtain which substring has been recognized.

It turns out that 123456 is not substring of teste 12 345 6 teste. And therefore, you won’t get 123456 as a response using only regex in a single step because 123456 is not exactly like this in the input string.

So you do this:

1. Uses the ((?:[\d][\s]?){5}[\d]) to locate the number with the spaces.
2. Strip the spaces later using a replace.