Form field with dynamic id validation

How can i validate fields with names like this

Code:

<select name="mechanic_134" id="mechanic-134" class="form-control selectpicker">

mechanic_ is the general field name &  134 is a id i am getting from database. there are more fields to come like mechanic_135........mechanic_150.


i want to know how can i validate this field with dynamic id. please show it in code level. how it is done in controller & how the error output in view

Thanks.

Use foreach to check the indexes of all post data.


Controller:

PHP Code:

function validate()
{
    $rules = array();

    foreach($this->input->post() as $name => $value)
    {
        if(strpos($name, 'mechanic_') !== false)
        {
            $rules[] = array(
                'field' => $name,
                'label' => [some label],
                'rules' => [some rules]
            );
        }
    }

    // set_rules can accept multi-dimensional array
    $this->form_validation->set_rules($rules);
} 


Views:
<?php echo  form_error('mechanic_134') ?>
<select name="mechanic_134" id="mechanic-134" class="form-control selectpicker">

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