QRScanner just scan once

I have used QRScanner to scan QR codes.

I decided to use QRScanner instead of BarcodeScanner because with the first one I can create my own design:

Docs says that scan method return and observable that emits the scanned text.

I have the next code to scan:

const scanSub = qrScanner.scan().subscribe((text: string) => {
  console.log('Scanned something', text);
  const slices = text.split('@');
  if (slices.length !== 3) {
      message: 'No es un código de seguridad válido',
      position: 'middle'
  } else {
    code: slices[1]

That’s because I’m looking for a string like 0.234283489283412@somethingImportant@0.23482394273422342
where I need to retrieve whatever is between @ sign. If it has not two @ signs it is an invalid string and scan until a valid one, otherwise I close the modal returning somethingImportant and unsubscribe for scanning. But it just scan once