java - 密码与正则表达式匹配

Question

我使用 java.util.regex.Pattern 来匹配满足以下条件的密码:

1. 至少 7 个字符
2. 只能由字母和数字组成
3. 至少一个字母和至少一个数字

我已经完成了 1 和 2，但我不知道如何做 3。

1 和 2 - [\\w]{7,}

有什么想法吗？

Answer 1

你可以使用这个。这基本上使用 lookahead达到第三个要求。

(?=.*\d)(?=.*[a-zA-Z])\w{7,}

或 Java 字符串

"(?=.*\\d)(?=.*[a-zA-Z])\\w{7,}"

说明

"(?=" +         // Assert that the regex below can be matched, starting at this position (positive lookahead)
   "." +           // Match any single character
      "*" +           // Between zero and unlimited times, as many times as possible, giving back as needed (greedy)
   "\\d" +          // Match a single digit 0..9
")" +
"(?=" +         // Assert that the regex below can be matched, starting at this position (positive lookahead)
   "." +           // Match any single character
      "*" +           // Between zero and unlimited times, as many times as possible, giving back as needed (greedy)
"[a-zA-Z]" +       // Match a single character present in the list below
                     // A character in the range between “a” and “z”
                     // A character in the range between “A” and “Z”
")" +
"\\w" +          // Match a single character that is a “word character” (letters, digits, and underscores)
   "{7,}"          // Between 7 and unlimited times, as many times as possible, giving back as needed (greedy)

编辑

如果您想包含 unicode 字母支持，请使用此

(?=.*\d)(?=.*\pL)[\pL\d]{7,}