@Email and @Pattern in Spring Boot - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to validate an email field using the correct annotation.

Spring Boot

public class User {
    @[1]
    private String email;
}

Drag options to blanks, or click blank then click option'

ASize

BPattern

CNotNull

DEmail

Attempts:

3 left

💡 Hint

Common Mistakes

Using @Pattern without a regex for email.

Using @NotNull which only checks for null values.

The @Email annotation is used to validate that the string is a valid email address format.

2fill in blank

medium

Complete the code to validate a username with only letters and digits using @Pattern.

Spring Boot

public class User {
    @Pattern(regexp = "[1]")
    private String username;
}

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A^[a-zA-Z0-9]+$

B^\\d+$

C^[a-z]+$

D^.+$"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a regex that allows special characters.

Forgetting to use anchors ^ and $.

The regex ^[a-zA-Z0-9]+$ ensures the username contains only letters and digits.

3fill in blank

hard

Fix the error in the @Pattern regex to allow emails with dots and dashes.

Spring Boot

public class User {
    @Pattern(regexp = "[1]")
    private String email;
}

Drag options to blanks, or click blank then click option'

A^[a-zA-Z0-9]+@[a-zA-Z0-9]+\\.[a-zA-Z]+$

B^[a-zA-Z0-9]+@[a-zA-Z0-9]+$

C^[a-zA-Z0-9._%+-]+@[a-zA-Z0-9.-]+\\.[a-zA-Z]{2,6}$

D^[a-zA-Z0-9]+$"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a regex that does not allow dots or dashes.

Using a regex that does not validate the domain properly.

This regex allows letters, digits, dots, underscores, percent, plus, and dash before the @, and dots and dashes in the domain part, ending with a valid TLD.

4fill in blank

hard

Fill both blanks to validate a password with at least 8 characters and only letters and digits.

Spring Boot

public class User {
    @Pattern(regexp = "[1]")
    @Size(min = [2])
    private String password;
}

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A^[a-zA-Z0-9]+$

B8

C6

D^[a-z]+$"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a regex that allows special characters.

Setting the minimum size too low.

The regex ^[a-zA-Z0-9]+$ allows only letters and digits. The @Size(min = 8) ensures the password is at least 8 characters long.

5fill in blank

hard

Fill all three blanks to validate a phone number with exactly 10 digits using @Pattern and @Size.

Spring Boot

public class User {
    @Pattern(regexp = "[1]")
    @Size(min = [2], max = [3])
    private String phoneNumber;
}

Drag options to blanks, or click blank then click option'

A^\\d+$

B10

D^[a-zA-Z]+$"

Attempts:

3 left

💡 Hint

Common Mistakes

Using a regex that allows letters.

Setting min and max size differently.

The regex ^\\d+$ ensures only digits. The @Size(min = 10, max = 10) ensures the phone number is exactly 10 digits long.