Check password valid using regex in javascript

Question

The password must be eight characters or longer
The password must contain at least 2 lowercase alphabetical character.
The password must contain at least 2 uppercase alphabetical character.
The password must contain at least 2 numeric character.
The password must contain at least 2 special character.

My code

function checkPass(pw) {
var regx = new RegExp("^(?=.*[a-z]{2})(?=.*[A-Z]{2})(?=.*[0-9]{2})(?=.*[!@#\$%\^&\*\)\(]{2})(?=.{8,})");
return regx.test(pw);

}

checkPass('PAssword12#$') => true
checkPass('PaSsword12#$') => false

I want to funtion return true when 2 uppercase character is not sequential.

Thanks!

Wiktor Stribiżew · Accepted Answer · 2016-01-14 13:23:12Z

1

You need to use the $ anchor to check for length (and best is to move that check out from lookaheads) and to allow some non-uppercase letters in between like this:

function checkPass(pw) {
  var regx = /^(?=(?:[^a-z]*[a-z]){2})(?=(?:[^A-Z]*[A-Z]){2})(?=(?:\D*\d){2})(?=(?:[^!@#$%^&*)(]*[!@#$%^&*)(]){2}).{8,}$/;
  return regx.test(pw);
 }
document.write(checkPass('PAssword12#$') + "<br>");
document.write(checkPass('PaSsword12#$'));

Note that I used the principle of contrast: (?:[^a-z]*[a-z]){2} matches 2 sequences of symbols other than a-z zero or more times followed by 1 lowercase letter. I modified all the lookaheads the same way.

answered Jan 14, 2016 at 13:23

Wiktor Stribiżew

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Comments

John Clifford · Accepted Answer · 2016-01-14 13:18:48Z

1

Rather than having [A-Z]{2} which will only match two uppercase characters together, you'll have to put in an optional match for any other characters in between two separate ranges (you'll have to do this for the lowercase, numbers and symbols as well). So you would instead put

[A-Z].*?[A-Z]

You also don't actually need to check whether it's at least 8 characters, because any password meeting the criteria for lowercase/uppercase letters, numbers and symbols has to be 8 characters at minimum anyway.

answered Jan 14, 2016 at 13:18

John Clifford

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