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Regular Expressions to Validate Google Analytics Tracking Id

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Given some Google Analytics Tracking IDs, the task is to check if they are valid or not using regular expressions. Rules for the valid Tracking Id are:

  • It is an alphanumeric string i.e., containing digits (0-9), alphabets (A-Z), and a Special character hyphen(-).
  • The hyphen will come in between the given Google Analytics Tracking Id.
  • Google Analytics Tracking Id should not start and end with a hyphen (-).
  • It should not contains whitespaces and other special characters rather than a hyphen symbol.

Examples:

Input: str = ”AB-1234-45”
Output: True

Input: str = ”AB-1234-”
Output: False
Explanation: Google Analytics Tracking Id never ends with a hyphen.

Approach: The problem can be solved based on the following idea:

Create a regex pattern to validate the number as written below:   
regex = ^[A-Z]{2}[-]{0, 1}[0-9]{1, }[-]{0, 1}[0-9]{1, }$

Where,

  • ^: Indiactes the start of the string
  • [A-Z]{2}: This pattern will allow two of the preceding items if they are uppercase alphabets (A-Z).
  • [-]{0, 1}: This pattern will match zero or one of the preceding items if it is a hyphen symbol.
  • [0-9]{1}: This pattern will allow one or more than one preceding items  if it is a digit.
  • $ : Indicates the end of the string.

Follow the below steps to implement the idea:

  • Create a regex expression forTracking Id.
  • Use Pattern class to compile the regex formed.
  • Use the matcher function to check whether the Tracking id is valid or not.
  • If it is valid, return true. Otherwise, return false.

Below is the code implementation of the above-discussed approach:

Java




// Java program to validate the
// Google Analytics Tracking Id
// using Regular Expression
import java.util.regex.*;
 
class GFG {
 
    // Function to validate the
    // Google Analytics Tracking Id
    public static boolean isValidGoogleAnaTrId(String str)
    {
 
        // Regex to check valid Google
        // Analytics Tracking Id
        String regex
            = "^[A-Z]{2}[-]{0, 1}[0-9]{1, }[-]{0, 1}[0-9]{1, }$";
 
        // Compile the Regex
        Pattern p = Pattern.compile(regex);
 
        // If the str
        // is empty return false
        if (str == null) {
            return false;
        }
 
        // Pattern class contains matcher()
        // method to find matching between
        // given str Code using regex.
        Matcher m = p.matcher(str);
 
        // Return if the str Code
        // matched the ReGex
        return m.matches();
    }
 
    // Driver Code.
    public static void main(String args[])
    {
 
        // Test Case 1:
        String str1 = "AB-1234-45";
        System.out.println(isValidGoogleAnaTrId(str1));
 
        // Test Case 2:
        String str2 = "AB-1234-";
        System.out.println(isValidGoogleAnaTrId(str2));
 
        // Test Case 3:
        String str3 = "-AB-1234-";
        System.out.println(isValidGoogleAnaTrId(str3));
 
        // Test Case 4:
        String str4 = "AB-1234-1";
        System.out.println(isValidGoogleAnaTrId(str4));
    }
}


C++




// C++ program to validate the
// Google Analytics Tracking Id
// using Regular Expression
#include <bits/stdc++.h>
#include <regex>
using namespace std;
 
// Function to validate the
// Google Analytics Tracking Id
string isValidGoogleAnaTrId(string str)
{
    // Regex to check valid
    // Google Analytics Tracking Id
    const regex pattern(
        "^[A-Z]{2}[-]{0, 1}[0-9]{1, }[-]{0, 1}[0-9]{1, }$");
 
    // If the str
    // is empty return false
    if (str.empty()) {
        return "false";
    }
 
    // Return true if the str
    // matched the ReGex
    if (regex_match(str, pattern)) {
        return "true";
    }
    else {
        return "false";
    }
}
 
// Driver Code
int main()
{
    // Test Case 1:
    string str1 = "AB-1234-45";
    cout << isValidGoogleAnaTrId(str1) << endl;
 
    // Test Case 2:
    string str2 = "AB-1234-";
    cout << isValidGoogleAnaTrId(str2) << endl;
 
    // Test Case 3:
    string str3 = "-AB-1234-";
    cout << isValidGoogleAnaTrId(str3) << endl;
 
    // Test Case 4:
    string str4 = "AB-1234-1";
    cout << isValidGoogleAnaTrId(str4) << endl;
 
    return 0;
}


Python3




# Python3 program to validate
# Google Analytics Tracking Id using Regular
# Expression
 
import re
 
 
# Function to validate
# Google Analytics Tracking Id
def isValidGoogleAnaTrId(str):
 
    # Regex to check valid Google Analytics Tracking Id
    regex = "^[A-Z]{2}[-]{0, 1}[0-9]{1, }[-]{0, 1}[0-9]{1, }$"
 
    # Compile the ReGex
    p = re.compile(regex)
 
    # If the string is empty
    # return false
    if (str == None):
        return "false"
 
    # Return if the string
    # matched the ReGex
    if(re.search(p, str)):
        return "true"
    else:
        return "false"
 
 
# Driver code
if __name__ == '__main__':
 
    # Test Case 1:
    str1 = "AB-1234-45"
    print(isValidGoogleAnaTrId(str1))
 
    # Test Case 2:
    str2 = "AB-1234-"
    print(isValidGoogleAnaTrId(str2))
 
    # Test Case 3:
    str3 = "-AB-1234-"
    print(isValidGoogleAnaTrId(str3))
 
    # Test Case 4:
    str4 = "AB-1234-1"
    print(isValidGoogleAnaTrId(str4))


C#




// C# program to validate the
// Google Analytics Tracking Id
// using Regular Expressions
using System;
using System.Text.RegularExpressions;
class GFG {
 
    // Main Method
    static void Main(string[] args)
    {
 
        // Input strings to Match
        // Google Analytics Tracking Id
        string[] str = { "AB-1234-45", "AB-1234-",
                         "-AB-1234-", "AB-1234-1" };
        foreach(string s in str)
        {
            Console.WriteLine(
                isValidGoogleAnaTrId(s) ? "true" : "false");
        }
        Console.ReadKey();
    }
 
    // method containing the regex
    public static bool isValidGoogleAnaTrId(string str)
    {
        string strRegex
            = @"^[A-Z]{2}[-]{0, 1}[0-9]{1, }[-]{0, 1}[0-9]{1, }$";
        Regex re = new Regex(strRegex);
        if (re.IsMatch(str))
            return (true);
        else
            return (false);
    }
}


PHP




<?php
// PHP program to validate Google Analytics Tracking Id
// Function to validate Google Analytics Tracking Id using regular expression
function isValidGoogleAnaTrId($str){
if(preg_match('/^[A-Z]{2}[-]{0, 1}[0-9]{1, }[-]{0, 1}[0-9]{1, }$/', $str)) {
echo "true\n";
} else {
echo "false\n";
}
}
isValidGoogleAnaTrId("AB-1234-45");
isValidGoogleAnaTrId("AB-1234-");
isValidGoogleAnaTrId("-AB-1234-");
isValidGoogleAnaTrId("AB-1234-1");
?>


Javascript




// Javascript program to validate
// Google Analytics Tracking Id using Regular Expression
 
// Function to validate the
// Google Analytics Tracking Id
function isValidGoogleAnaTrId(str) {
    // Regex to check valid
    // Google Analytics Tracking Id
    let regex = new RegExp(/^[A-Z]{2}[-]{0, 1}[0-9]{1, }[-]{0, 1}[0-9]{1, }$/);
 
    // if str
    // is empty return false
    if (str == null) {
        return "false";
    }
 
    // Return true if the str
    // matched the ReGex
    if (regex.test(str) == true) {
        return "true";
    }
    else {
        return "false";
    }
}
 
// Driver Code
// Test Case 1:
let str1 = "AB-1234-45";
console.log(isValidGoogleAnaTrId(str1));
 
// Test Case 2:
let str2 = "AB-1234-";
console.log(isValidGoogleAnaTrId(str2));
 
// Test Case 3:
let str3 = "-AB-1234-";
console.log(isValidGoogleAnaTrId(str3));
 
// Test Case 4:
let str4 = "AB-1234-1";
console.log(isValidGoogleAnaTrId(str4));


Output

true
false
false
true

Time Complexity: O(N) for each testcase, where N is the length of the given string. 
Auxiliary Space: O(1)  

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Last Updated : 27 Jan, 2023
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