我正在用Racket的子语言Plait做一个项目,我需要验证电话号码。电话号码的格式应为
“xxx xxx xxxx”
其中区号为
"787"
或
"939"
。但是,Plait并不直接支持正则表达式。如何在不使用regex的情况下验证这些电话号码?
这是我当前的代码:
#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)
验证电话号码时发生以下错误:
enter image description here
define:错误语法在:(define(validate phone number phone)(define phone pattern(regexp“^\(787\|939\)-[0-9]{3}-[0-9]{4}$“))(regexp匹配?电话模式电话))
