密码的正则表达式=一个数字，大小写字母和特殊字符，但是！！开始或结束时没有特殊字符

Question

null

Answer 1

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

一行：

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

如果您不喜欢\w，它等于[a-zA-Z0-9_]，请将其替换为该组并删除下划线。