javascript - regex for password

Question

I'm trying to get regex for minimum requirements of a password to be minimum of 6 characters; 1 uppercase, 1 lowercase, and 1 number. Seems easy enough? I have not had any experience in regex's that "look ahead", so I would just do:

if(!pwStr.match(/[A-Z]+/) || !pwStr.match(/[a-z]+/) || !pwStr.match(/[0-9]+/) ||
    pwStr.length < 6)
    //was not successful

But I'd like to optimize this to one regex and level up my regex skillz in the process.

Answer 1

^.*(?=.{6,})(?=.*[a-zA-Z])(?=.*d)(?=.*[!&$%&? "]).*$

• ^.*
  Start of Regex
• (?=.{6,})
  Passwords will contain at least 6 characters in length
• (?=.*[a-zA-Z])
  Passwords will contain at least 1 upper and 1 lower case letter
• (?=.*d)
  Passwords will contain at least 1 number
• (?=.*[!#$%&? "]) Passwords will contain at least given special characters
• .*$
  End of Regex

here is the website that you can check this regex - http://rubular.com/