Answer Posted / Santosh Saraswat

In Apache Wicket, you can create a custom FormValidator for username validation. Here's an example using Regular Expression (regex) to validate usernames:nn```javanpublic class UsernameValidator extends FormValidator<String> {n private static final String REGEX = "^[a-zA-Z0-9_-]{3,20}$";n public UsernameValidator() {n super(REGEX);n }n}n```nIn the form's add() method, you can register the validator for the username field:n```javanForm form = new Form("login") {n @Overriden protected void onSubmit() {n // Handle form submission heren }n};nTextField<String> usernameField = new TextField<String>("username", this);nusernameField.add(new UsernameValidator());nform.add(usernameField);n```

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