how to use Validation in laravel

Validator::make(
    ['key' => 'Foo'],
    ['key' => 'required|in:Foo']
);
Validator::extend('foo', function($attribute, $value, $params){});
Validator::extend('foo', 'FooValidator@validate');
Validator::resolver(function($translator, $data, $rules, $msgs)
{
    return new FooValidator($translator, $data, $rules, $msgs);
});

Rules

accepted
active_url
after:YYYY-MM-DD
before:YYYY-MM-DD
alpha
alpha_dash
alpha_num
between:1,10
confirmed
date
date_format:YYYY-MM-DD
different:fieldname
email
exists:table,column
image
in:foo,bar,baz
not_in:foo,bar,baz
integer
numeric
ip
max:value
min:value
mimes:jpeg,png
regex:[0-9]
required
required_if:field,value
required_with:foo,bar,baz
required_without:foo,bar,baz
same:field
size:value
unique:table,column,exceptIDs
url