Check if the given RGB color code is valid or not

Last Updated : 15 Nov, 2023

Given three numbers R, G and B as the color code for Red, Green and Blue respectively as in the form of RGB color code. The task is to know whether the given color code is valid or not.

RGB Format: The RGB(Red, Green, Blue) format is used to define the color of an HTML element by specifying the R, G, B values range between 0 to 255. For example: RGB value of Red color is (255, 0, 0), Green color is (0, 255, 0), Blue color is (0, 0, 255) etc.

color: rgb(R, G, B);

Note: The color code is valid when all numbers are in the range [0, 255].

Examples:

Input: R=0, G=100, B=255
Output: True
Explanation: Every color is in range [0, 255]

Input: R=0, G=200, B=355
Output: False
Explanation: Blue is not in range [0, 255]

Approach: To check if the color code is valid or not we need to check if each of the color is in the range [0, 255] or not. If any of the color is not in this range, return false, else return true.

Below is the implementation of the approach:

C++

#include <iostream>
using namespace std;
 
// Function to check validity
// of the color code
bool isValidRGB(int R, int G, int B)
{
 
    if (R < 0 || R > 255)
        return false;
    else if (G < 0 || G > 255)
        return false;
    else if (B < 0 || B > 255)
        return false;
    else
        return true;
}
 
// Driver code
int main()
{
 
    int R, G, B;
 
    // Check if rgb(0, 0, 0) is valid or not
    R = 0, G = 0, B = 0;
    (isValidRGB(R, G, B)) ? cout << "true\n"
                          : cout << "false\n";
 
    // Check if rgb(0, 100, 255) is valid or not
    R = 0, G = 100, B = 255;
    (isValidRGB(R, G, B)) ? cout << "true\n"
                          : cout << "false\n";
 
    // Check if rgb(0, 200, 355) is valid or not
    R = 0, G = 200, B = 355;
    (isValidRGB(R, G, B)) ? cout << "true\n"
                          : cout << "false\n";
 
    // Check if rgb(-100, 0, 255) is valid or not
    R = -100, G = 0, B = 255;
    (isValidRGB(R, G, B)) ? cout << "true\n"
                          : cout << "false\n";
    return 0;
}

Java

class GFG {
 
    // Function to check validity
    // of the color code
    public static boolean isValidRGB(int R, int G, int B) {
 
        if (R < 0 || R > 255)
            return false;
        else if (G < 0 || G > 255)
            return false;
        else if (B < 0 || B > 255)
            return false;
        else
            return true;
    }
 
    // Driver code
    public static void main(String args[]) {
 
        int R, G, B;
 
        // Check if rgb(0, 0, 0) is valid or not
        R = 0;
        G = 0;
        B = 0;
        if (isValidRGB(R, G, B))
            System.out.println("true");
        else
            System.out.println("false");
 
        // Check if rgb(0, 100, 255) is valid or not
        R = 0;
        G = 100;
        B = 255;
        if (isValidRGB(R, G, B))
            System.out.println("true");
        else
            System.out.println("false");
 
        // Check if rgb(0, 200, 355) is valid or not
        R = 0;
        G = 200;
        B = 355;
        if (isValidRGB(R, G, B))
            System.out.println("true");
        else
            System.out.println("false");
 
        // Check if rgb(-100, 0, 255) is valid or not
        R = -100;
        G = 0;
        B = 255;
        if (isValidRGB(R, G, B))
            System.out.println("true");
        else
            System.out.println("false");
    }
}
 
// This code is contributed by saurabh_jaiswal

Python3

# Function to check validity
# of the color code
def isValidRGB(R, G, B) :
 
    if (R < 0 or R > 255) :
        return False;
         
    elif (G < 0 or G > 255) :
        return False;
         
    elif (B < 0 or B > 255) :
        return False;
         
    else :
        return True;
 
# Driver code
if __name__ ==  "__main__" :
 
    # Check if rgb(0, 0, 0) is valid or not
    R = 0; G = 0; B = 0;
     
    if isValidRGB(R, G, B) :
        print("true")
    else :
        print("false")
 
    # Check if rgb(0, 100, 255) is valid or not
    R = 0; G = 100; B = 255;
     
    if isValidRGB(R, G, B) :
        print("true")
    else :
        print("false")
 
    # Check if rgb(0, 200, 355) is valid or not
    R = 0; G = 200; B = 355;
     
    if isValidRGB(R, G, B) :
        print("true")
    else :
        print("false")
         
    # Check if rgb(-100, 0, 255) is valid or not
    R = -100; G = 0; B = 255;
     
    if isValidRGB(R, G, B) :
        print("true")
    else :
        print("false")
 
    # This code is contributed by AnkThon

C#

using System;
public class GFG {
 
    // Function to check validity
    // of the color code
    public static bool isValidRGB(int R, int G, int B) {
 
        if (R < 0 || R > 255)
            return false;
             
        else if (G < 0 || G > 255)
            return false;
             
        else if (B < 0 || B > 255)
            return false;
             
        else
            return true;
    }
 
    // Driver code
    public static void Main(string []args) {
 
        int R, G, B;
 
        // Check if rgb(0, 0, 0) is valid or not
        R = 0;
        G = 0;
        B = 0;
        if (isValidRGB(R, G, B))
            Console.WriteLine("true");
        else
            Console.WriteLine("false");
 
        // Check if rgb(0, 100, 255) is valid or not
        R = 0;
        G = 100;
        B = 255;
        if (isValidRGB(R, G, B))
            Console.WriteLine("true");
        else
            Console.WriteLine("false");
 
        // Check if rgb(0, 200, 355) is valid or not
        R = 0;
        G = 200;
        B = 355;
        if (isValidRGB(R, G, B))
            Console.WriteLine("true");
        else
            Console.WriteLine("false");
 
        // Check if rgb(-100, 0, 255) is valid or not
        R = -100;
        G = 0;
        B = 255;
        if (isValidRGB(R, G, B))
            Console.WriteLine("true");
        else
            Console.WriteLine("false");
    }
}
 
// This code is contributed by AnkThon

Javascript

<script>
 
    // Function to check validity
    // of the color code
    const isValidRGB = (R, G, B) => {
 
        if (R < 0 || R > 255)
            return false;
        else if (G < 0 || G > 255)
            return false;
        else if (B < 0 || B > 255)
            return false;
        else
            return true;
    }
 
    // Driver code
 
    let R, G, B;
 
    // Check if rgb(0, 0, 0) is valid or not
    R = 0, G = 0, B = 0;
    (isValidRGB(R, G, B)) ? document.write("true<br/>")
        : document.write("false<br/>");
 
    // Check if rgb(0, 100, 255) is valid or not
    R = 0, G = 100, B = 255;
    (isValidRGB(R, G, B)) ? document.write("true<br/>")
        : document.write("false<br/>");
 
    // Check if rgb(0, 200, 355) is valid or not
    R = 0, G = 200, B = 355;
    (isValidRGB(R, G, B)) ? document.write("true<br/>")
        : document.write("false<br/>");
 
    // Check if rgb(-100, 0, 255) is valid or not
    R = -100, G = 0, B = 255;
    (isValidRGB(R, G, B)) ? document.write("true<br/>")
        : document.write("false<br/>");
 
    // This code is contributed by rakeshsahni
 
</script>

Output

true
true
false
false

Time Complexity: O(1)
Auxiliary Space: O(1)

Approach 2: Using Regular Expression:

This approach uses regular expressions to match valid RGB color codes.
The regular expression pattern ^rgb$(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)$$ matches a string that starts with “rgb(“, followed by three comma-separated integers (each representing a color component), and ends with “)”.
The integers are matched using regex character classes to ensure that they are between 0 and 255 (inclusive).
The \s* in between the commas and integers matches any whitespace characters (including none) between them. The ^ and $ at the beginning and end of the pattern ensure that the entire string is matched, i.e., there are no extraneous characters before or after the color code.

Here is the code of above approach:

C++

#include <iostream>
#include <regex>
using namespace std;
 
// Function to check validity of the color code
bool isValidRGB(string colorCode) {
    // Regular expression to match valid RGB color codes
    regex pattern("^rgb\\((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\)$");
 
    // Check if the color code matches the pattern
    return regex_match(colorCode, pattern);
}
 
// Driver code
int main() {
    // Check if rgb(0, 0, 0) is valid or not
    string colorCode = "rgb(0, 0, 0)";
    (isValidRGB(colorCode)) ? cout << "true\n" : cout << "false\n";
 
    // Check if rgb(0, 100, 255) is valid or not
    colorCode = "rgb(0, 100, 255)";
    (isValidRGB(colorCode)) ? cout << "true\n" : cout << "false\n";
 
    // Check if rgb(0, 200, 355) is valid or not
    colorCode = "rgb(0, 200, 355)";
    (isValidRGB(colorCode)) ? cout << "true\n" : cout << "false\n";
 
    // Check if rgb(-100, 0, 255) is valid or not
    colorCode = "rgb(-100, 0, 255)";
    (isValidRGB(colorCode)) ? cout << "true\n" : cout << "false\n";
 
    return 0;
}

Java

import java.util.regex.*;
 
public class GFG {
    // Function to check validity of the color code
    public static boolean isValidRGB(String colorCode)
    {
        // Regular expression to match valid RGB color codes
        String pattern
            = "^rgb\\((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\)$";
 
        // Create a Pattern object
        Pattern regexPattern = Pattern.compile(pattern);
 
        // Create a Matcher object
        Matcher matcher = regexPattern.matcher(colorCode);
 
        // Check if the color code matches the pattern
        return matcher.matches();
    }
 
    // Driver code
    public static void main(String[] args)
    {
        // Check if rgb(0, 0, 0) is valid or not
        String colorCode = "rgb(0, 0, 0)";
        System.out.println(isValidRGB(colorCode));
 
        // Check if rgb(0, 100, 255) is valid or not
        colorCode = "rgb(0, 100, 255)";
        System.out.println(isValidRGB(colorCode));
 
        // Check if rgb(0, 200, 355) is valid or not
        colorCode = "rgb(0, 200, 355)";
        System.out.println(isValidRGB(colorCode));
 
        // Check if rgb(-100, 0, 255) is valid or not
        colorCode = "rgb(-100, 0, 255)";
        System.out.println(isValidRGB(colorCode));
    }
}
// This code is contributed by Taranpreet Singh.

Python3

import re
 
# Function to check validity of the color code
 
 
def is_valid_rgb(color_code):
    # Regular expression to match valid RGB color codes
    pattern = r'^rgb\((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\)$'
 
    # Check if the color code matches the pattern
    return re.match(pattern, color_code) is not None
 
 
# Driver code
if __name__ == "__main__":
    # Check if rgb(0, 0, 0) is valid or not
    color_code = "rgb(0, 0, 0)"
    print("true" if is_valid_rgb(color_code) else "false")
 
    # Check if rgb(0, 100, 255) is valid or not
    color_code = "rgb(0, 100, 255)"
    print("true" if is_valid_rgb(color_code) else "false")
 
    # Check if rgb(0, 200, 355) is valid or not
    color_code = "rgb(0, 200, 355)"
    print("true" if is_valid_rgb(color_code) else "false")
 
    # Check if rgb(-100, 0, 255) is valid or not
    color_code = "rgb(-100, 0, 255)"
    print("true" if is_valid_rgb(color_code) else "false")
 
# This code is contributed by Taranpreet Singh.

C#

using System;
using System.Text.RegularExpressions;
 
public class GFG {
    // Function to check the validity of the color code
    public static bool IsValidRGB(string colorCode)
    {
        // Regular expression to match valid RGB color codes
        Regex pattern = new Regex(
            @"^rgb\((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\)$");
 
        // Check if the color code matches the pattern
        return pattern.IsMatch(colorCode);
    }
 
    public static void Main()
    {
        // Check if rgb(0, 0, 0) is valid or not
        string colorCode = "rgb(0, 0, 0)";
        Console.WriteLine(IsValidRGB(colorCode));
 
        // Check if rgb(0, 100, 255) is valid or not
        colorCode = "rgb(0, 100, 255)";
        Console.WriteLine(IsValidRGB(colorCode));
 
        // Check if rgb(0, 200, 355) is valid or not
        colorCode = "rgb(0, 200, 355)";
        Console.WriteLine(IsValidRGB(colorCode));
 
        // Check if rgb(-100, 0, 255) is valid or not
        colorCode = "rgb(-100, 0, 255)";
        Console.WriteLine(IsValidRGB(colorCode));
    }
}

Javascript

// Function to check validity of the color code
function isValidRGB(colorCode) {
    // Regular expression to match valid RGB color codes
    const pattern = /^rgb\((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?),\s*(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\)$/;
 
    // Check if the color code matches the pattern
    return pattern.test(colorCode);
}
 
// Example usage
let colorCode = "rgb(0, 0, 0)";
console.log(isValidRGB(colorCode)); // Output: true
 
colorCode = "rgb(0, 100, 255)";
console.log(isValidRGB(colorCode)); // Output: true
 
colorCode = "rgb(0, 200, 355)";
console.log(isValidRGB(colorCode)); // Output: false
 
colorCode = "rgb(-100, 0, 255)";
console.log(isValidRGB(colorCode)); // Output: false

Output

true
true
false
false

Time Complexity: O(1)
Auxiliary Space: O(1)

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Check if the given RGB color code is valid or not

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