Password Regex Java Validator

The Password Regex Java Validator is a tool for developers who want to ensure that user passwords meet specific security criteria. With Java regex, you can enforce rules like minimum length, inclusion of uppercase/lowercase letters, numbers, and symbols—ensuring robust password strength right from your input forms or APIs.

If you’re building signup or login systems, you can also try the Email Regex Java Validator and Phone Number Regex Java Validator to validate related fields.

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Possible security issues ▾

This regex appears to be safe.

Explanation ▾

[A-Z]: uppercase letters
[a-z]: lowercase letters
[0-9]: digits
\.: a literal dot
+: one or more of the preceding
*: zero or more of the preceding
?: optional (zero or one)
^: start of string
$: end of string

Match information ▾

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Regular Expression - Documentation

What is Password Regex in Java?

Password regex is a regular expression designed to validate passwords against security standards such as length, complexity, and character mix.

These patterns are used in:

User registration and authentication
Password reset forms
Secure system access (e.g., admin panels, APIs)

Password Regex Pattern (Java)

Common rules for strong passwords include:

Minimum 8 characters
At least one uppercase letter
At least one lowercase letter
At least one digit
At least one special character

Recommended Regex Pattern:

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

This pattern ensures:

(?=.*[a-z]) → at least one lowercase letter
(?=.*[A-Z]) → at least one uppercase letter
(?=.*\\d) → at least one digit
(?=.*[@$!%*?&]) → at least one special character
[A-Za-z\\d@$!%*?&]{8,} → at least 8 characters in total

How It Works

Input your password in the tool.
Choose or enter a Java regex pattern.
Instantly see whether your input matches the rule.
Tweak your pattern and test multiple password types.

Java Code Example

import java.util.regex.Pattern;
import java.util.regex.Matcher;

public class PasswordValidator {
    public static void main(String[] args) {
        String password = "Secure@2024";
        String regex = "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[@$!%*?&])[A-Za-z\\d@$!%*?&]{8,}$";

        Pattern pattern = Pattern.compile(regex);
        Matcher matcher = pattern.matcher(password);

        if (matcher.matches()) {
            System.out.println("Password is strong and valid.");
        } else {
            System.out.println("Password does not meet the criteria.");
        }
    }
}

Examples

Password123! → Valid (meets all conditions)
Welcome@Qodex9 → Valid
pass1234 → Missing uppercase and special character
PASSWORD! → Missing lowercase and digit
Qodex123 → Missing special character

Use Cases

Signup Forms: Enforce strong password policies during registration.
Admin Panels: Ensure secure credentials for privileged accounts.
API Keys: Create secure passphrases for backend systems.
User Onboarding: Guide users to create stronger passwords using pattern hints.

Pro Tips

Avoid weak passwords like abc123, password, or common dictionary words.
Add {8,20} to limit max length: ...{8,20}$
Adjust special characters allowed by editing the last set [A-Za-z\\d@$!%*?&]
Want to visually assess password strength? Pair this with a Java Regex Tester for more complex debugging.

Combine with These Tools

Email Regex Java Validator: Use together for registration and login validation.
Java Regex Tester: Preview and debug regex live in Java.
Base64 Encoder: Encode passwords or tokens if needed.
UUID Regex Java Validator: Secure identifier generation for password reset links.