normalizeDiallableCharsOnly() public static method

Normalizes a string of characters representing a phone number. This strips all characters which are not diallable on a mobile phone keypad (including all non-ASCII digits).
public static normalizeDiallableCharsOnly ( string $number ) : string
$number string a string of characters representing a phone number
return string the normalized string version of the phone number
 public function testNormaliseStripNonDiallableCharacters()
 {
     $inputNumber = "03*4-56&+a#234";
     $expectedOutput = "03*456+234";
     $this->assertEquals($expectedOutput, $this->phoneUtil->normalizeDiallableCharsOnly($inputNumber), "Conversion did not correctly remove non-diallable characters");
 }