Question

1. C++ Write. Feel free to create a form/GUI or use console to create a regular expression to determine if a phone number input is valid. You will need to import a regular expression library. My code below as an example.

         string phoneNum =txtName.Text;

         string MatchPhonePattern = @"\(?\d{3}\)?[. -]? *\d{3}[. -]? *[. -]?\d{4}";

      Regex rx = new Regex(MatchPhonePattern, RegexOptions.Compiled | RegexOptions.IgnoreCase);

        Match match = rx.Match(phoneNum);

        if (match.Success)

            lblDisplay.Text = "Valid number";

        else

            lblDisplay.Text = "not valid";

Answer 1

#include <iostream>
#include <regex>
#include <string>
using namespace std;

int main()
{
    string userIn;
    cout << "Enter a valid phone number (xxx-xxx-xxxx): ";
    cin >> userIn;

    regex phone_num_pat("(\\+?1[- ]?)?\\(?(\\d{3})\\)?[\\s-]?(\\d{3})[\\s-]?(\\d{4})");

    if(regex_match(userIn, phone_num_pat))
        cout << endl << userIn << " is a valid phone number" << endl;
    else
        cout << endl << userIn << " is not a valid phone number" << endl;

    return 0;
}

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