密码的正则表达式=一个数字、大写字母和小写字母以及特殊字符,但是!!开头或结尾没有特殊字符

没那么难:

(                   # Start of group
    (?=.*\d)        #   must contain at least one digit
    (?=.*[A-Z])     #   must contain at least one uppercase character
    (?=.*[a-z])     #   must contain at least one lowercase character
    (?=.*\W)        #   must contain at least one special symbol
    \w
       .            #   match anything with previous condition checking
        {6,18}      #   length is  characters
    \w 
)                   # End of group

在一行中:

((?=.*\d)(?=.*[A-Z])(?=.*[a-z])(?=.*\W)\w.{6,18}\w)

如果你不喜欢 \w 等于 [a-zA-Z0-9_] 将其替换为该组并删除下划线。

然而,我完全支持ctwheels的论点。