Regular expression for password complexity

by

try this regex here:

((?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%]).{8,40})

(           # Start of group
  (?=.*\d)      #   must contains one digit from 0-9
  (?=.*[a-z])       #   must contains one lowercase characters
  (?=.*[A-Z])       #   must contains one uppercase characters
  (?=.*[@#$%])      #   must contains one special symbols in the list "@#$%"
              .     #     match anything with previous condition checking
                {8,40}  #        length at least 8 characters and maximum of 40 
)

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