Parser::stripExtension

public function stripExtension(&$phoneNumber)
{
	$extension = "";
	$extensionSeparator = "";

	if(preg_match("/[" . $this->extensionSeparators ."]/", $phoneNumber, $matches, PREG_OFFSET_CAPTURE))
	{
		$extensionSeparator = $matches[0][0];
		$separatorPosition = $matches[0][1];
		$extension = mb_substr($phoneNumber, $separatorPosition + 1);
		$phoneNumber = mb_substr($phoneNumber, 0, $separatorPosition);
	}
	return [$extensionSeparator, $extension];
}