example_extended_laravel_validation.php

<?php

namespace App\Http\Requests;

use App\Http\Requests\Request;
use Illuminate\Support\Facades\Route;

class OfficeRequests extends Request
{
    /**
     * Determine if the user is authorized to make this request.
     *
     * @return bool
     */
    public function authorize()
    {
        return true;
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules()
    {
        \Validator::extend('longitude', function($attribute, $value, $parameters)
        {
            return preg_match('/^[-]?((((1[0-7][0-9])|([0-9]?[0-9]))\.(\d+))|180(\.0+)?)$/', $value);
        }, 'The :attribute is not valid.');

        \Validator::extend('latitude', function($attribute, $value, $parameters)
        {
            return preg_match('/^[-]?(([0-8]?[0-9])\.(\d+))|(90(\.0+)?)$/', $value);
        }, 'The :attribute is not valid.');

        if( Route::getCurrentRoute()->getPath() == 'office/create' )
        {
            return [
                'name'              => 'required',
                'address1'          => 'required',
                'city'              => 'required',
                'postcode'          => 'required',
                'telephone'         => 'required',
                'longitude'         => 'required|longitude',
                'latitude'          => 'required|latitude',
                'region'            => 'required'
            ];
        }

        if( Route::getCurrentRoute()->getPath() == 'office/edit/{id}' )
        {
            return [
                'name'              => 'required',
                'address1'          => 'required',
                'city'              => 'required',
                'postcode'          => 'required',
                'telephone'         => 'required',
                'longitude'         => 'required|longitude',
                'latitude'          => 'required|latitude',
                'region'            => 'required'
            ];
        }
    }
}

Regex longitude and latitude validation class for Laravel 5.0+.