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[symfony] Form Builder and Constraint Example

$form = $this->container->get('form.factory')->createNamedBuilder('payment', 'form');

        $form
            ->add('name', 'text', [
                'attr' => ['placeholder' => "Name on Card"],
                'constraints' => [
                    new Assert\NotBlank()
                ]
            ])
            ->add('card', 'text', [
                'attr' => [
                    'placeholder' => "Card Number",
                    'maxlength' => 16
                ],
                'constraints' => [
                    new Assert\NotBlank(),
                    new Assert\Length(16),
                    new Assert\Type(['type' => "numeric"])
                ]
            ])
            ->add('date', 'text', [
                'attr' => [
                    'placeholder' => "MM / YY",
                    'autocomplete' => "off",
                    'maxlength' => 7
                ],
                'constraints' => [
                    new Assert\NotBlank(),
                    new Assert\Regex(['pattern' => "/^\d{1,2}\s*\/\s*\d{2}$/"])
                ]
            ])
            ->add('cvc', 'text', [
                'attr' => [
                    'placeholder' => "CVC",
                    'autocomplete' => "off",
                    'maxlength' => 3
                ],
                'constraints' => [
                    new Assert\NotBlank(),
                    new Assert\Length(3),
                    new Assert\Type(['type' => "numeric"])
                ]
            ]);

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