Can someone tell me if this is right please? +c. Write a BNF grammar and a regular expression that describes thestructure of US telephone numbers, which can either be (xxx)xxx-xxxx orXXX-XXXX, where x is a digit from 0 to 9.Grammar ::= | ::= "(" ")" "-" "-" ::= "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"Regular expression(\(\d{3}\)\d{3}-\d{4}|\d{3}-\d{4})

This BNF grammar is appropriate for US telephone numbers in the following two formats:(xxx)xxx-xxxx,…

Answered: + c. Write a BNF grammar and a regular…

C++ for Engineers and Scientists

4th Edition

ISBN:9781133187844

Author:Bronson, Gary J.

Publisher:Bronson, Gary J.

Chapter12: Adding Functionality To Your Classes

Section12.5: Virtual Functions

Problem 5E

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