Catrinblaidd

function nextString($text, $str) {
  \preg_match("/{$str}[\r\n]+([^\r\n]+)/u", $text, $matches);
  if (isset($matches[1])) {
    return $matches[1];
  } else {
    return false;
  }
}

$string = "SIP/rosnet_6651560/808080808080,300,Tt";
\preg_match('/\/([\d]+)\,/', $string, $result);
echo $result[1];

$preg = '/USER\-[0-9]+\-[A-Z]{1}/';
$result = \str_replace(['\\', '/'], '', $preg);
\preg_match_all('/\[([\w\d-]+)\][{]*([\+\*\d,]+)[}]*/', $preg, $match);
$maxCount = 10;
if (!empty($match[0])) {
  foreach ($match[1] as $key => $part) {
    $part = \explode('-', $part);
    $range = \range($part[0], $part[1]);
    $countData = $match[2][$key];
    if ($countData == '+') {
      $count = \mt_rand(1, $maxCount);
    } elseif ($countData == '*') {
      $count = \mt_rand(0, $maxCount);
    } else {
      $countData = \explode(',', $countData);
      if (isset($countData[1])) {
        $count = \mt_rand($countData[0], $countData[1]);
      } else {
        $count = $countData[0];
      }
    }
    $n = 0;
    $generated = '';
    $rangeTotal = \sizeof($range);
    for ($n; $n < $count; ++$n) {
      $randKey = \mt_rand (0, $rangeTotal - 1);
      $generated .= $range[$randKey];
    }
    $replace = $match[0][$key];
    $result = \str_replace($replace, $generated, $result);
  }
}
echo $result;