Calculating number of characters in a field.

[V1212]

Is it possible to calculate the number of characters in a field? I've tried using Count() but the expression doesn't work. 

var lengthArray= [$feature.id]

if (count(lengthArray)!=10)

{

return false;

}

else return true;

Thanks in advance! 

[DavidPike · Accepted solution]

Why are you creating a list/array? the count is always going to be 1.

var length = Count(Text($feature.id))

if (length != 10) {
  return false
}
else {
  return true
}