input format html code example

Example 1: html textbox pattern mobile number

<input type="text" name="Phone Number" pattern="[7-9]{1}[0-9]{9}" 
       title="Phone number with 7-9 and remaing 9 digit with 0-9">

Example 2: name validation html

<input type="text" pattern="[a-zA-Z'-'\s]*">

Example 3: input formatting

1/* Test Formatting Input (TestFormattedInput.cpp) */
#include <iostream>
#include <iomanip>
#include <string>
using namespace std;
 
int main() {
   string areaCode, phoneCode;
   string inStr;
 
   cout << "Enter your phone number in this format (xxx)xxx-xxxx : ";
   cin.ignore();   // skip '('
   cin >> setw(3) >> areaCode;
   cin.ignore();   // skip ')'
   cin >> setw(3) >> phoneCode;
   cin.ignore();   // skip '-'
   cin >> setw(4) >> inStr;
   phoneCode += inStr;
 
   cout << "Phone number is (" << areaCode << ")"
        << phoneCode.substr(0, 3) << "-"
        << phoneCode.substr(3, 4) << endl;
   return 0;
}
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