Regex expression not working for password validation

Question

I am trying to develop a regex pattern for password with following conditions 1) atleast 1 Uppercase character 2) atleast 3 lower case characters 3) atleast 1 digit 4) atleast 1 Special character 5) Minimum length should be 8 characters. This is my javascript function. Can somebody help me with the expression. Thanks

validatePassword : function(password){
        if(this.isEmpty(password))
        {
            return false;
        }
        var regex = /^(?=.*[A-Z])(?=.*[!@#$&*])(?=.*[0-9])(?=.*[a-z].*[a-z].*[a-z]).{8}$/;
        if(!regex.test(password))
        {
            return false
        }
        return true
    }

Why the specific requirement of at least 3 lowercase characters? You're complicating it for both you as developer and the user who will have to pick a password matching your very specific rules. Refer to this answer, where you can find very similar regex (at least 1 lowercase, uppercase, digit special character and length of 8+). Also some simplifications, you don't need to check for empty as this regex will fail in that case, and you can just use return regex.text(password). — Marko Gresak
– Marko Gresak, Commented Apr 30, 2016 at 2:13

StoledInk · Accepted Answer · 2016-04-30 02:33:58Z

1

/^(?=.*?[A-Z])(?=(?:.*[a-z]){3})(?=.*?[0-9])(?=.*?[^\w\s]).{8,}$/

This regex will enforce these rules:

• At least one upper case
• At least three lower case
• At least one digit
• At least one special character
• Minimum 8 in length

JSFIDDLE

edited Apr 30, 2016 at 2:33

answered Apr 30, 2016 at 2:12

StoledInk

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5 Comments

Marko Gresak Over a year ago

Wouldn't the {2,} be at least 2 lowercase characters?

chan Over a year ago

for atleast 3, it should be {3,}.. isn't it?

timolawl Over a year ago

you want to use .* instead of .? as you want the lookahead to match any number of characters before the lookahead specific match. The lower case match should be (?=(?:.*[a-z]){3}).

StoledInk Over a year ago

@chan if you used {3,} lower case validation must be 4 characters instead, you can see the outcome above link.

StoledInk Over a year ago

@timolawl thanks for another answer. I updated the code

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