src/Model/Attribute/Accessor/Entity.php
public function setEntity(?string $entity)
    {
        if (null !== $entity) {
            if (!preg_match('/^[a-z]+$/i', $entity)) {
                throw new DomainException('Entity is not valid.');
            }
        }

        $this->entity = $entity;

        return $this;
    }
public function setEntity(?string $entity)
    {
        if (null !== $entity) {
            if (!preg_match('/^[a-z]+$/i', $entity)) {
                throw new DomainException('Entity is not valid.');
            }
        }

        $this->entity = $entity;

        return $this;
    }
Set entity

@param string $entity
@return object
@throws \DomainException