How to validate south korean personal  custom clearance code (PCCC) using javascript/jquery?

Hi Experts,
I tried every means to figure out the validation for south Korean "Personal Custom Clearance Code" (PCCC). I didn't find enough resources about it other than some blog and articles about requirement of pcc code as mandatory for importing. PCCC is the code that is used for clearing the custom if someone is buying stuffs/products internationally. It is like ssn in the USA having 13 digits in total starting with letter "P". For example: P123451234512. I am not sure if I could ask this kind of question here but if someone knows about it, that would be nice.  All I did till now is I validated a text box for PCCC by length=13 under html. Is there anyone who know how to validate the PCC code using javascript?

<fieldset>
      <legend>Validate korean PCCC</legend>
      <div style= "padding-top:15px;">
            <label style= "padding: 20px; font-size: 16px; font-weight:600; color: #AA6903;">Personal Custom Clearance Code: </label>
            <input type="text" id="inputcpf" name="pccc" size="13" maxlength="13" autofocus>
            <input type="button" style= "margin-top:10px;" class="btnchec" name="Submit" value="Check">
      </div>
</fieldset>

Thank you