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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
Im 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 definetype and leveraged within the language's functions. Welcome to DrRacket, version
Language: plait, with debugging; memory limit:
The phone numbers should be in the format xxxxxxxxxx where the area code is either or 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
type digit
;; Define a type for three digits a sequence of digits
type threedigits digit digit digit
;; Define a type for four digits a sequence of digits
type fourdigits digit digit digit digit
;; Define a type for the area code or
type areacode
;; Define a type for the phone number format: xxxxxxXXXX
definetype phonenumberString
;; Function to validate the phone number
:: validatephonenumber String Boolean
define validatephonenumber phone
define phonepattern regexp $
regexpmatch? phonepattern phone
;; Test cases
validatephonenumber ;; should return #t true
validatephonenumber ;; should return #t true
validatephonenumber ;; should return #f false
validatephonenumber ;; should return #f false
The following error occurs when validating the phone number:
define: bad syntax in: define validatephonenumber phonedefine phonepattern regexp $regexpmatch? phonepattern phone
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