正则表达式:php 的密码验证 - Regex: Password validation of php

Regex: Password validation of php

本文关键字：密码验证 php 正则表达式 | 更新日期: 2023-09-27

我正在对我的新项目进行一些密码验证。我有这个规则，我想使用 php preg_match（）函数在正则表达式模式上转换：

接受所有字符。
空格除外。
至少 4 个字符。
最多 20 个字符。

提前谢谢你！

试试这个

(?s)^('S{4,20})$

解释

"(?s)" +     // Match the remainder of the regex with the options: dot matches newline (s)
"^" +        // Assert position at the beginning of the string
"(" +        // Match the regular expression below and capture its match into backreference number 1
   "''S" +       // Match a single character that is a “non-whitespace character”
      "{4,20}" +      // Between 4 and 20 times, as many times as possible, giving back as needed (greedy)
")" +
"$"          // Assert position at the end of the string (or before the line break at the end of the string, if any)