html - 如何限制非字母字符不是密码的第一个或最后一个字符

Question

如何限制密码，使其不允许第一个或最后一个字符为非字母字符（参见“标题”）？

我的 HTML 代码：

<form action = "." method="post">
  <input type="password" 
    placeholder = "New Password..." 
    name= "password" 
    title = "Password must be at least 8 characters, at least one alphabetic character [a-zA-Z], at least one non-alphabetic character, which is not the first or last character." 
    pattern="(?=.*\d)(?=.*[a-z])(?=.*[A-Z]).{8,}">
</form>

*hi123HI示例：密码 hi123*HI 被接受，但由于第一个字符是第一个字符，我如何拒绝*（如果*是最后一个字符，或者特殊字符或数字既是第一个字符又是最后一个字符）。

Answer 1

添加负前瞻以检查初始字符和最终字符：

/(?![^A-Z])(?!.*[^A-Z]$)(?=.*[A-Z])(?=.*[^A-Z]).{8,}/i
 ^^^^^^^^^^                                               NO INITIAL SPECIAL CHAR
           ^^^^^^^^^^^^^                                  NO FINAL SPECIAL CHAR
                        ^^^^^^^^^^^                       AT LEAST ONE LETTER
                                   ^^^^^^^^^^^^           AT LEAST ONE SPECIAL CHAR
                                               ^^^^^^     EIGHT OR MORE CHARS