A custom Eircode validation rule for laravel. Using the REGEX from Manwal's answer on this stackoverflow question. https://stackoverflow.com/questions/33391412/validation-for-irish-eircode

Eircode.php

<?php

namespace App\Rules;

use Illuminate\Contracts\Validation\Rule;

class Eircode implements Rule
{
    /**
     * Create a new rule instance.
     *
     * @return void
     */
    public function __construct()
    {
        //
    }

    /**
     * Determine if the validation rule passes.
     *
     * @param  string  $attribute
     * @param  mixed  $value
     * @return bool
     */
    public function passes($attribute, $value)
    {
        return preg_match('/^[AC-Y]{1}[0-9]{1}[0-9W]{1}[ \-]?[0-9AC-Y]{4}$/', $value);
    }

    /**
     * Get the validation error message.
     *
     * @return string
     */
    public function message()
    {
        return 'Eircode not valid';
    }
}