求教1简单正则？回帖给分

$str = '0510-12323475,,';
$pattern = '/,?\d{4}-\d+,?/';

var_dump(preg_match($pattern, $str));

------解决方案--------------------
PHP code
$ar = array(
 '0510-12323475,0781-26354589,021-25698746',
 '0521-25698745,,',
 '0521-25698745,021-25698475',
 '0317-88641,ttttttt',
);

$pattern = '/(?:\d{3,}-\d+,|,){3}/';

foreach($ar as $v) {
  $v = trim($v) . str_repeat(',', 3-substr_count($v, ','));//补齐逗号
  echo $v . ' ' . preg_match($pattern, $v) , PHP_EOL;
}

------解决方案--------------------
探讨

老大，我只要$pattern的正则。但是你的$pattern不行。