Regex for password must contain at least eight characters, at least one number and both lower and uppercase letters and special characters

I want a regular expression to check that:

A password contains at least eight characters, including at least one number and includes both lower and uppercase letters and special characters, for example #, ?, !.

It cannot be your old password or contain your username, "password", or "websitename"

And here is my validation expression which is for eight characters including one uppercase letter, one lowercase letter, and one number or special character.

(?=^.{8,}$)((?=.*\d)|(?=.*\W+))(?![.\n])(?=.*[A-Z])(?=.*[a-z]).*$"

How can I write it for a password must be eight characters including one uppercase letter, one special character and alphanumeric characters?

Answers:

Answer

Minimum eight characters, at least one letter and one number:

"^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{8,}$"

Minimum eight characters, at least one letter, one number and one special character:

"^(?=.*[A-Za-z])(?=.*\d)(?=.*[@$!%*#?&])[A-Za-z\[email protected]$!%*#?&]{8,}$"

Minimum eight characters, at least one uppercase letter, one lowercase letter and one number:

"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d]{8,}$"

Minimum eight characters, at least one uppercase letter, one lowercase letter, one number and one special character:

"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\[email protected]$!%*?&]{8,}$"

Minimum eight and maximum 10 characters, at least one uppercase letter, one lowercase letter, one number and one special character:

"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\[email protected]$!%*?&]{8,10}$"
Answer

You may use this regex with multiple lookahead assertions (conditions):

^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9])(?=.*?[#[email protected]$%^&*-]).{8,}$

This regex will enforce these rules:

  • At least one upper case English letter, (?=.*?[A-Z])
  • At least one lower case English letter, (?=.*?[a-z])
  • At least one digit, (?=.*?[0-9])
  • At least one special character, (?=.*?[#[email protected]$%^&*-])
  • Minimum eight in length .{8,} (with the anchors)
Answer

Regular expressions don't have an AND operator, so it's pretty hard to write a regex that matches valid passwords, when validity is defined by something AND something else AND something else...

But, regular expressions do have an OR operator, so just apply DeMorgan's theorem, and write a regex that matches invalid passwords:

Anything with less than eight characters OR anything with no numbers OR anything with no uppercase OR or anything with no lowercase OR anything with no special characters.

So:

^(.{0,7}|[^0-9]*|[^A-Z]*|[^a-z]*|[a-zA-Z0-9]*)$

If anything matches that, then it's an invalid password.

Answer

Just a small improvement for @anubhava's answer: Since special character are limited to the ones in the keyboard, use this for any special character:

^(?=.*?[A-Z])(?=(.*[a-z]){1,})(?=(.*[\d]){1,})(?=(.*[\W]){1,})(?!.*\s).{8,}$

This regex will enforce these rules:

  • At least one upper case English letter
  • At least one lower case English letter
  • At least one digit
  • At least one special character
  • Minimum eight in length
Answer

I had some difficulty following the most popular answer for my circumstances. For example, my validation was failing with characters such as ; or [. I was not interested in white-listing my special characters, so I instead leveraged [^\w\s] as a test - simply put - match non word characters (including numeric) and non white space characters. To summarize, here is what worked for me...

  • at least 8 characters
  • at least 1 numeric character
  • at least 1 lowercase letter
  • at least 1 uppercase letter
  • at least 1 special character

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

JSFiddle Link - simple demo covering various cases

Answer

Import the JavaScript file jquery.validate.min.js.

You can use this method:

$.validator.addMethod("pwcheck", function (value) {
    return /[\@\#\$\%\^\&\*\(\)\_\+\!]/.test(value) && /[a-z]/.test(value) && /[0-9]/.test(value) && /[A-Z]/.test(value)
});
  1. At least one upper case English letter
  2. At least one lower case English letter
  3. At least one digit
  4. At least one special character
Answer

A more "generic" version(?), allowing none English letters as special characters.

^(?=\S*[a-z])(?=\S*[A-Z])(?=\S*\d)(?=\S*[^\w\s])\S{8,}$

var pwdList = [
    '@@V4-\3Z`zTzM{>k',
    '12qw!"QW12',
    '123qweASD!"#',
    '1qA!"#$%&',
    'Günther32',
    '123456789',
    'qweASD123',
    'qweqQWEQWEqw',
    '12qwAS!'
  ],
  re = /^(?=\S*[a-z])(?=\S*[A-Z])(?=\S*\d)(?=\S*[^\w\s])\S{8,}$/;
  
  pwdList.forEach(function (pw) {
    document.write('<span style="color:'+ (re.test(pw) ? 'green':'red') + '">' + pw + '</span><br/>');
  });

Answer

Try this one:

  1. Minimum six characters
  2. At least one uppercase character
  3. At least one lowercase character
  4. At least one special character

Expression:

"/^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[[email protected]$!%*?&.])[A-Za-z\[email protected]$!%*?&.]{6, 20}/"

Optional Special Characters:

  1. At least one special character
  2. At least one number
  3. Special characters are optional
  4. Minimum six characters and maximum 16 characters

Expression:

"/^(?=.*\d)(?=.*[a-zA-Z]).{6,20}$/"

If the min and max condition is not required then remove .{6, 16}

  • 6 is minimum character limit
  • 20 is maximum character limit
  • ?= means match expression
Answer

I would reply to Peter Mortensen, but I don't have enough reputation.

His expressions are perfect for each of the specified minimum requirements. The problem with his expressions that don't require special characters is that they also don't ALLOW special characters, so they also enforce maximum requirements, which I don't believe the OP requested. Normally you want to allow your users to make their password as strong as they want; why restrict strong passwords?

So, his "minimum eight characters, at least one letter and one number" expression:

^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\d]{8,}$

achieves the minimum requirement, but the remaining characters can only be letter and numbers. To allow (but not require) special characters, you should use something like:

^(?=.*[A-Za-z])(?=.*\d).{8,}$ to allow any characters

or

^(?=.*[A-Za-z])(?=.*\d)[A-Za-z\[email protected]$!%*#?&]{8,}$ to allow specific special characters

Likewise, "minimum eight characters, at least one uppercase letter, one lowercase letter and one number:"

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d]{8,}$

meets that minimum requirement, but only allows letters and numbers. Use:

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d).{8,}$ to allow any characters

or

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[A-Za-z\[email protected]$!%*?&]{8,} to allow specific special characters.

Answer
Use the following Regex to satisfy the below conditions:

Conditions: 1] Min 1 uppercase letter.
            2] Min 1 lowercase letter.
            3] Min 1 special character.
            4] Min 1 number.
            5] Min 8 characters.
            6] Max 30 characters.

Regex: /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[#[email protected]!%&*?])[A-Za-z\d#[email protected]!%&*?]{8,30}$/    
Answer

Not directly answering the question, but does it really have to be a regex?

I used to do lots of Perl, and got used to solving problems with regexes. However, when they get more complicated with all the look-aheads and other quirks, you need to write dozens of unit tests to kill all those little bugs.

Furthermore, a regex is typically a few times slower than an imperative or a functional solution.

For example, the following (not very FP) Scala function solves the original question about three times faster than the regex of the most popular answer. What it does is also so clear that you don't need a unit test at all:

def validatePassword(password: String): Boolean = {
  if (password.length < 8)
    return false

  var lower = false
  var upper = false
  var numbers = false
  var special = false

  password.foreach { c =>
    if (c.isDigit)       numbers = true
    else if (c.isLower)  lower = true
    else if (c.isUpper)  upper = true
    else                 special = true
  }

  lower && upper && numbers && special
}
Answer

What about considering the following regex solution:

^(?=.*[\w])(?=.*[\W])[\w\W]{8,}$

Which validates the following:

  1. At least one lowercase
  2. At least one uppercase
  3. At least one digit
  4. At least one special character
  5. At least it should have 8 characters long.

Check it out working at the following link https://regex101.com/r/qPmC06/4/

Answer

According to your need this pattern should work just fine. Try this,

^(?=(.*\d){1})(.*\S)(?=.*[a-zA-Z\S])[0-9a-zA-Z\S]{8,}

Just create a string variable, assign the pattern, and create a boolean method which returns true if the pattern is correct, else false.

Sample:

String pattern = "^(?=(.*\d){1})(.*\S)(?=.*[a-zA-Z\S])[0-9a-zA-Z\S]{8,}";
String password_string = "Type the password here"

private boolean isValidPassword(String password_string) {
    return password_string.matches(Constants.passwordPattern);
}
Answer
(?=.*[0-9])(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+-]).{6}
Answer

@ClasG has already suggested:

^(?=\S*[a-z])(?=\S*[A-Z])(?=\S*\d)(?=\S*[^\w\s])\S{8,}$

but it does not accept _(underscore) as a special character (eg. Aa12345_).

An improved one is:

^(?=\S*[a-z])(?=\S*[A-Z])(?=\S*\d)(?=\S*([^\w\s]|[_]))\S{8,}$
Answer

I've found many problems here, so I made my own.

Here it is in all it's glory, with tests:

^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*([^a-zA-Z\d\s])).{9,}$

https://regex101.com/r/DCRR65/4/tests

Things to look out for:

  1. doesn't use \w because that includes _, which I'm testing for.
  2. I've had lots of troubles matching symbols, without matching the end of the line.
  3. Doesn't specify symbols specifically, this is also because different locales may have different symbols on their keyboards that they may want to use.
Answer

Demo:

function password_check() {
  pass = document.getElementById("password").value;
  console.log(pass);
  regex = /^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[@$!%*?&])[A-Za-z\[email protected]$!%*?&]{8,}$/;
  if (regex.exec(pass) == null) {
    alert('invalid password!')
  }
  else {
    console.log("valid");
  }
}
<input type="text" id="password" value="[email protected]">
<input type="button" id="submit" onclick="password_check()" value="submit">

Answer

Use the following Regex to satisfy the below conditions:

Conditions: 1] Min 1 special character.
            2] Min 1 number.
            3] Min 8 characters or More

Regex: ^(?=.*\d)(?=.*[#[email protected]!%&*?])[A-Za-z\d#[email protected]!%&*?]{8,}$

Can Test Online: https://regex101.com

Answer

Just we can do this by using HTML5.

Use below code in pattern attribute,

pattern="(?=^.{8,}$)((?=.*\d)(?=.*\W+))(?![.\n])(?=.*[A-Z])(?=.*[a-z]).*$"

It will work perfectly.

Answer

You can use the below regular expression pattern to check the password whether it matches your expectations or not.

((?=.*\\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[[email protected]#$%^&*()]).{8,20})
Answer

Use this,

((?=.*\d)(?=.*[a-z])(?=.*[A-Z])(?=.*[[email protected]#$%?=*&]).{8,20})

It will validate for at least one lowercase, one upper case, one number and the special charecters of (!,@,#,$,%,?,=,*,&).

Minimum length is 8 and maximum length is 20

Answer

In Java/Android, to test a password with at least one number, one letter, one special character in following pattern:

"^(?=.*[A-Za-z])(?=.*\\d)(?=.*[[email protected]$!%*#?&])[A-Za-z\\[email protected]$!%*#?&]{8,}$"
Answer

Try this:

^.*(?=.{8,})(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=])[[email protected]#$%^&+=]*$

This regular expression works for me perfectly.

function myFunction() {
    var str = "[email protected]";
    var patt = new RegExp("^.*(?=.{8,})(?=.*[a-z])(?=.*[A-Z])(?=.*[@#$%^&+=])[[email protected]#$%^&+=]*$");
    var res = patt.test(str);
    console.log("Is regular matches:", res);
}
Answer

Pattern to match at least 1 upper case character, 1 digit and any special characters and the length between 8 to 63.

"^(?=.[a-z])(?=.[A-Z])(?=.*\d)[a-zA-Z\d\W]{8,63}$"

This pattern was used for JAVA programming.

Answer

Hope the below works. I tried this in Azure custom policy.

^(?=.[a-z])(?=.[A-Z])(?=.\d)(?=.[@#$%^&*-_+=[]{}|\:',?/~&quot;();!])([A-Za-z\[email protected]#$%^&amp;*\-_+=[\]{}|\\:',?/~"();!]|.([email protected])){6,16}$

Answer
(?=.*[a-z])(?=.*[A-Z])(?=.*\d)[a-zA-Z\d]{8,}$

Link check online https://regex101.com/r/mqGurh/1

Answer

I've actually just copied the first answer here and turned it into a more ux-convenient regex which needs one upper, one lower and at least 8 chars but accepts everything "in between".

This one is an example-regex which requires

  1. at least 8 characters length
  2. at least one lowercase letter
  3. at least one uppercase letter

IMPORTANT: This regex will also except all other characters e.g. numbers, special characters like $,#,! etc. - as long as the rules 1. to 3. match the input string

^(?=.*[a-z])(?=.*[A-Z]).{8,}$

Mind the "." alomst at the end of the regex. This will match almost any (and afaik any readable) character

Answer

A solution I found in one of the previous answer as:

*Minimum 8 characters at least 1 Uppercase Alphabet, 1 Lowercase Alphabet, 1 Number and 1 Special Character:

"^(?=.*[a-z])(?=.*[A-Z])(?=.*\d)(?=.*[[email protected]$!%*?&])[A-Za-z\[email protected]$!%*?&]{8,}"*

...didn't work for me, but the following is a simplified version and works great (add any special character you like, I added # here), and add the number rule as you do with the letters as:

"^(?=.*[a-z])(?=.*[A-Z])(?=.*[0-9])(?=.*[[email protected]$!%*?&]){8,}"
Answer

If you would like to use regular expressions to check for minimum eight characters, at least one uppercase letter, at least one lowercase letter, at least one number from 0 to 9, and at least one special character from: [email protected]#$%^&*_? AND also give the user a bit more information about what they are missing in the password, you could use the following code:

let password = "@Aa3a4d$";

//  Check every single condition separately
let lowercase = password.match((/[a-z]+/g));
let uppercase = password.match((/[A-Z]+/g));
let digits = password.match((/[\d]+/g));
let special = password.match((/[[email protected]#$%^&*_]+/g));
let lenght = password.match((/[A-Za-z\[email protected]#$%^&*_]{8,}/g));

//  Array to store information about any mismatches in the string
let errors = [];

if (password === '' ) {
    errors.push('Password is required');
}
if (lowercase === null) {
    errors.push('Password must include at least one lowercase letter');
}
if (uppercase === null) {
    errors.push('Password must include at least one uppercase letter');
}
if (digits === null) {
    errors.push('Password must include at least one digit from 0 to 9');
}
if (special  === null) {
    errors.push('Password must include at least one special character');
}
if (lenght === null) {
    errors.push('Password must include at least 8 characters');
}
if (errors.length > 0) {
    console.log(errors);
    return;
} else {
    // Process your password
}
Answer

^(?=.[0-9])(?=.[a-z])(?=.[A-Z])(?=.[\/%§"&“|`´}{°><:.;#')(@_$"!?*=^-]).{8,}$

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