yup form validation with formik using regex not working as expected with bangla font input field

I write a regex code in registration model but when i input in formik form field with bangla font, regex express can't validate bangla unicode value.

import * as Yup from "yup";
const banglaLang = /^([A-Za-z]|\p{InBengali})$/i;
class RegisterModel {
  /**
   * Model properties
   */
  constructor() {
    this.employeeNameBn = "";
  }

  /**
   * Validator schema
   */
  validator() {
    return Yup.object().shape({
      employeeNameBn: Yup.string()
        .required("user full name (in Bangla) is a required field")
        .matches(banglaLang, "Please type in bangla"),
    });
  }
}

export const Register = new RegisterModel();