In Laravel, validation can be performed in a variety of ways. Here are the steps to perform validation in Laravel:

Create a validation rule:
The first step in performing validation in Laravel is to create a validation rule. Laravel provides a variety of built-in validation rules that can be used, such as required, email, numeric, and many more. Custom validation rules can also be created.

A validation rule can be created as follows:

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$rules = [
‘name’ => ‘required|string|max:255′,
’email’ => ‘required|email|unique:users|max:255’,
‘password’ => ‘required|string|min:8|confirmed’,
];
Here, we define the rules for the name, email, and password fields. The required rule ensures that the field is not empty, the string rule ensures that the field is a string, the email rule ensures that the field is a valid email address, the unique rule ensures that the email address is not already taken, and the max and min rules ensure that the length of the field is within a certain range.

Validate the input:
Once the validation rules have been defined, the input can be validated using the validate method provided by Laravel. This method takes two parameters: the input to be validated and the validation rules.

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$request->validate($rules);
Here, we call the validate method on the $request object and pass in the validation rules.

If the input fails validation, Laravel will automatically redirect the user back to the previous page with an error message. The error message can be displayed using the errors method, like this:

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@if ($errors->any())

@endif
This will display all the error messages in a list.

Custom error messages:
Laravel also allows custom error messages to be defined for each validation rule. This can be done by adding an associative array to the validation rule, like this:

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$messages = [
‘name.required’ => ‘The name field is required.’,
’email.required’ => ‘The email field is required.’,
’email.email’ => ‘Please enter a valid email address.’,
‘password.required’ => ‘The password field is required.’,
‘password.min’ => ‘The password must be at least 8 characters.’,
‘password.confirmed’ => ‘The password confirmation does not match.’,
];

$request->validate($rules, $messages);
Here, we define custom error messages for each validation rule using an associative array.

Overall, Laravel provides a powerful and flexible way to perform validation on user input. With its built-in validation rules, custom validation rules, and custom error messages, Laravel makes it easy to ensure that user input is valid and secure.