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Expression expression for E.164 does not work

I am using the following code:

    Pattern p = Pattern.compile("^\\+?[1-9]\\d{1,14}$"); 
    stringNumber=stringNumber.replace(" ","");
    Matcher m = p.matcher(stringNumber);


    if (!m.matches()) 
    {
    [...]
    }

And the template, which should correctly determine the numbers in the E.164 format, does not work, as I think, it should, because it gives a valid E.164 phone number, a number in the format XXXXXXXXX, which is X all digits from 0 to 9. And how much I look at the template, I can’t understand why.

The stricter pattern "^ \ +? \ D {10,14} $" really works because it detects that the number XXXXXXXXX is not in the format.

Perhaps the last template is enough for my applications, but I would like to use the first (one that could determine that the phone number is in E.164 format in each case) to get a wider range of possibilities, even if these possibilities are rare.

What can cause unexpected behavior with the first pattern?

+6
1

+ , ^\\+[1-9]\\d{1,14}$. ?, , + .

, , , - +, , , , 10- , 9 .

+4

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