How to give client side validation MVC

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Javascript

jQuery

MVC4

MVC5

I have given validation on server side but I need validation on typing itself. It must show the error message when typing is wrong.
controller

if (!string.IsNullOrEmpty(student.FirstName))
            {
                string nameRegex = @"^([a-zA-Z ])+$";
                Regex re = new Regex(nameRegex);
                if (!re.IsMatch(student.FirstName))
                {
                    ModelState.AddModelError("FirstName", "FirstName only be letters");
                }
            }
            else
            {
                ModelState.AddModelError("FirstName", "FirstName is required");
            }

I have given validation in regular expression Like this in controller part

I need to give validation for name that it should accept only letters and numbers and no special characters

model

public string FirstName { get; set; }

how can I do this ?? can anyone please help me to do this ?

What I have tried:

Have searched but didn't get correctly how to do this