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I ' m working on a project in Plait, a sublanguage of Racket, and I need to create a language that validates phone numbers. Types

I'm working on a project in Plait, a sublanguage of Racket, and I need to create a language that validates phone numbers. Types should be defined using define-type and leveraged within the language's functions. Welcome to DrRacket, version 8.12[cs].
Language: plait, with debugging; memory limit: 128MB.
The phone numbers should be in the format "xxx-xxx-xxxx" where the area code is either "787" or "939". However, Plait doesn't support regular expressions directly.
How can I validate these phone numbers without utilizing regex?
This is my current code:
#lang plait
;; Define a type for a single digit (0-9)
type digit =0|1|2|3|4|5|6|7|8|9
;; Define a type for three digits (a sequence of 3 digits)
type three-digits =[digit digit digit]
;; Define a type for four digits (a sequence of 4 digits)
type four-digits =[digit digit digit digit]
;; Define a type for the area code (787 or 939)
type area-code =787|939
;; Define a type for the phone number (format: xxx-xxx-XXXX)
(define-type (phone-number)(String))
;; Function to validate the phone number
(:: validate-phone-number (String -> Boolean))
(define (validate-phone-number phone)
(define phone-pattern (regexp "^\\(787\\|939\\)-[0-9]{3}-[0-9]{4}$"))
(regexp-match? phone-pattern phone))
;; Test cases
(validate-phone-number "787-123-4567") ;; should return #t (true)
(validate-phone-number "939-987-6543") ;; should return #t (true)
(validate-phone-number "800-123-4567") ;; should return #f (false)
(validate-phone-number "787-12-4567") ;; should return #f (false)
The following error occurs when validating the phone number:
define: bad syntax in: (define (validate-phone-number phone)(define phone-pattern (regexp "^\(787\|939\)-[0-9]{3}-[0-9]{4}$"))(regexp-match? phone-pattern phone))
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