RegEx library
Email regex
Phone number regex
IP address regex
Date regex
URL regex
Numbers only regex (digits only)
UUID regex
Regex match words
ZIP code regex
GUID regex
Password regex
HTML regex (regex remove html tags)
SSN regex
XML regex
Mac address regex
Street address regex

Password regex

Password regular expression can be used to verify that a password provided is strong enough to provide better protection against bot brute force attacks. This method, however, does not guarantee that a password will have enough entropy to be completely safe.

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JavaScript
Python
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Strong password regex

The regular expression below cheks that a password:

  • Has minimum 8 characters in length. Adjust it by modifying {8,}
  • At least one uppercase English letter. You can remove this condition by removing (?=.*?[A-Z])
  • At least one lowercase English letter.  You can remove this condition by removing (?=.*?[a-z])
  • At least one digit. You can remove this condition by removing (?=.*?[0-9])
  • At least one special character,  You can remove this condition by removing (?=.*?[#[email protected]$%^&*-])
/^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9])(?=.*?[#[email protected]$%^&*-]).{8,}$/
Test it!
/^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9])(?=.*?[#[email protected]$%^&*-]).{8,}$/

True

False

Enter a text in the input above to see the result

Example code in Javascript:

var passwordRegex = /^(?=.*?[A-Z])(?=.*?[a-z])(?=.*?[0-9])(?=.*?[#[email protected]$%^&*-]).{8,}$/;
// Validate password
passwordRegex.test('secret'); // Returns false
passwordRegex.test('-Secr3t.'); // Returns true
Test it!

True

False

Enter a text in the input above to see the result

Test it!

True

False

Enter a text in the input above to see the result

Notes on password regex validation

While this regex validation is better than nothing, in situations when additional security is needed you should also check the password entered for a set of commonly used passwords like:

  • .Qwerty1
  • !Q1w2e3r4
  • etc

One good list can be found here.