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.