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如何检查用户输入的密码格式。字符串不重复，使用用户必须选择数字、字符串（小写/大写）

听到是我的代码。我在 preg_match 中的问题是什么？

function checkPassFormat($ip)
{
    if(preg_match('/^[a-A][0-9]/', $password))
        return TRUE;
    else 
        return FALSE;
}
4

5 回答 5

1

I think this is a cute solution for the issue (you can also collect the errors and show the user a friendly message):

const SECURELEVEL_LOW = 1;
const SECURELEVEL_MEDIUM = 2;
const SECURELEVEL_HIGH = 3;
const SECURELEVEL_SERVICE = 4;

const CONTAINS_LETTERS = 1;
const CONTAINS_DIGITS = 2;
const CONTAINS_CASESENSITIVELETTERS = 4;
const CONTAINS_SPECIALCHARS = 8;

public function _isValid($value) {
    $valid = true;
    switch ($this->_options['secureLevel']) {
      case self::SECURELEVEL_SERVICE:
        $minLength = 20;
        $hasToContain = self::CONTAINS_LETTERS + self::CONTAINS_DIGITS + self::CONTAINS_CASESENSITIVELETTERS + self::CONTAINS_SPECIALCHARS;
        break;
      case self::SECURELEVEL_HIGH:
        $minLength = 8;
        $hasToContain = self::CONTAINS_LETTERS + self::CONTAINS_DIGITS + self::CONTAINS_CASESENSITIVELETTERS;
        break;
      case self::SECURELEVEL_LOW:
        $minLength = 4;
        $hasToContain = 0;
        break;
      case self::SECURELEVEL_MEDIUM:
      default:
        $minLength = 5;
        $hasToContain = self::CONTAINS_LETTERS + self::CONTAINS_DIGITS;
        break;
    }

    if (strlen($value) < $minLength) {
      $valid = false;
    }
    if (strpos($value, ' ') !== false) {
      $valid = false;
    }


    if ($hasToContain & self::CONTAINS_LETTERS) {
      // Password has to contain letters
      if (!preg_match('/[a-z]/i', $value)) {
        $valid = false;
      }
    }

    if ($hasToContain & self::CONTAINS_DIGITS) {
      // Password has to contain numbers
      if (!preg_match('/[0-9]/', $value)) {
        $valid = false;
      }
    }

    if ($hasToContain & self::CONTAINS_CASESENSITIVELETTERS) {
      // Password has to contain small and capital letters
      if (!preg_match('/[a-z]/', $value) || !preg_match('/[A-Z]/', $value)) {
        $valid = false;
      }
    }

    if ($hasToContain & self::CONTAINS_SPECIALCHARS) {
      // Password has to contain a special character
      if (!preg_match('/[^0-9a-zA-Z]/', $value)) {
        $valid = false;
      }
    }

    return $valid;
  }
于 2012-11-22T08:08:44.403 回答
0

我认为这[a-A]意味着您只允许 small 和 capital A。这应该是[a-zA-Z]。您也可以尝试[a-Z]，但在 C# 中，例如这不能按预期工作。

此外，您可能需要说“多个字母后跟多个数字”：[a-zA-Z]+[0-9]+。这将允许像abDCkl98.

如果你想混合字母和数字，你应该做类似的事情[a-zA-Z0-9]+。这适用于像a9Bdc4re.

于 2012-11-22T07:54:32.233 回答
0

尝试这个：

preg_match("/^[a-zA-Z0-9]+$/", $password)
于 2012-11-22T07:56:26.623 回答
0

按照您的示例，这是另一种选择：

"/[:alpha:][:digit:]/"
于 2012-11-22T07:56:31.693 回答
0 
试试这个
$pattern = "/^[a-zA-Z0-9]*$/i";
if(preg_match($pattern, $value)){           
   返回真；
}别的{
   返回假；
}
于 2012-11-22T07:59:27.300 回答