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Validate Gender using Regular Expressions

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  • Last Updated : 20 Dec, 2022
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Given some words of Gender, the task is to check if they are valid or not using regular expressions. The correct responses can be as given below:

  • Male / male / MALE / M / m
  • Female / female / FEMALE / F / f
  • Not prefer to say

Example:

Input: M
Output: True

Input: S
Output: False

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

Create a regex pattern to validate the number as written below: 

regex= “(?:m|M|male|Male|f|F|female|Female|FEMALE|MALE|Not prefer to say)$”

Just check whether any of the words are present in regex or not using (?:)

Follow the below steps to implement the idea:

  • Create a regular expression for Gender.
  • If the Input string is empty, return False.
  • Else, Use the Pattern class to compile the regex formed.
  • Use the matcher function to check whether the Gender Is valid or not.
  • If it is valid, return true. Otherwise, return false.

Below is the Implementation of the above approach:

C++

// C++ program to validate the GENDER
// using Regular Expression

#include <bits/stdc++.h>
#include <regex>
using namespace std;

// Function to validate the GENDER
string isValidGender(string str)
{
    // Regex to check valid GENDER .
    const regex pattern(
        "(?:m|M|male|Male|f|F|female|Female|FEMALE|MALE|"
        "Not prefer to say)$");

    // If the GENDER is empty return false
    if (str.empty()) {
        return "false";
    }

    // Return true if the GENDER
    // matched the ReGex
    if (regex_match(str, pattern)) {
        return "true";
    }
    else {
        return "false";
    }
}

// Driver Code
int main()
{
    // Test Case 1:
    string str1 = "m";
    cout << isValidGender(str1) << endl;

    // Test Case 2:
    string str2 = "f";
    cout << isValidGender(str2) << endl;

    // Test Case 3:
    string str3 = "F";
    cout << isValidGender(str3) << endl;

    // Test Case 4:
    string str4 = "M";
    cout << isValidGender(str4) << endl;

    // Test Case 5:
    string str5 = "MALE";
    cout << isValidGender(str5) << endl;

    // Test Case 6:
    string str6 = "S";
    cout << isValidGender(str6) << endl;

    // Test case 7:
    string str7 = "Not prefer to say";
    cout << isValidGender(str7) << endl;

    return 0;
}

Java

// Java program to validate the GENDER
// using Regular Expression

import java.io.*;
import java.util.regex.*;

class GFG {

    // Function to validate the GENDER
    public static boolean isValidGender(String str)
    {
        // Regex to check valid GENDER
        String regex
            = "(?:m|M|male|Male|f|F|female|Female|FEMALE|MALE|Not prefer to say)$";

        // Compile the ReGex
        Pattern p = Pattern.compile(regex);

        // If the GENDER is empty return false
        if (str == null) {
            return false;
        }

        // Pattern class contains matcher()
        // method to find matching between
        // given GENDER using regex.
        Matcher m = p.matcher(str);

        // Return if the str matched the ReGex
        return m.matches();
    }

    // Driver Code.
    public static void main(String args[])
    {
        // Test Case 1:
        String str1 = "m";
        System.out.println(isValidGender(str1));

        // Test Case 2:
        String str2 = "f";
        System.out.println(isValidGender(str2));

        // Test Case 3:
        String str3 = "F";
        System.out.println(isValidGender(str3));

        // Test Case 4:
        String str4 = "M";
        System.out.println(isValidGender(str4));

        // Test Case 5:
        String str5 = "FEMALE";
        System.out.println(isValidGender(str5));

        // Test Case 6:
        String str6 = "S";
        System.out.println(isValidGender(str6));

        // Test case 7:
        String str7 = "Not prefer to say";
        System.out.println(isValidGender(str7));
    }
}

Python3

# Python3 program to validate GENDER 
# using Regular Expression

import re

# Function to validate GENDER
def isValidGender(str):

    # Regex to check valid GENDER
    regex = "(?:m|M|male|Male|f|F|female|Female|FEMALE|MALE|Not prefer to say)$"
    
    # 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 = "m"
    print(isValidGender(str1))
    
    # Test Case 2:
    str2 = "f"
    print(isValidGender(str2))
    
    # Test Case 3:
    str3 = "F"
    print(isValidGender(str3))
    
    # Test Case 4:
    str4 = "M"
    print(isValidGender(str4))
    
    # Test Case 5:
    str5 = "FEMALE"
    print(isValidGender(str5))
    
    # Test Case 6:
    str6 = "S"
    print(isValidGender(str6))
    
    # Test Case 7:
    str7 = "Not prefer to say"
    print(isValidGender(str7))

C#

// C# program to validate the GENDER
// using Regular Expression

using System;
using System.Text.RegularExpressions;

public class GFG {

    // Function to validate the GENDER
    public static bool isValidGender(string str)
    {
        // Regex to check valid GENDER
        string regex
            = "(?:m|M|male|Male|f|F|female|Female|FEMALE|MALE|Not prefer to say)$";

        // Compile the ReGex
        Regex p = new Regex(regex);

        // If the GENDER is empty return false
        if (str == null) {
            return false;
        }

        // Pattern class contains matcher()
        // method to find matching between
        // given GENDER using regex.
        Match m = p.Match(str);

        // Return if the str matched the ReGex
        return m.Success;
    }

    // Driver Code.
    public static void Main()
    {
        // Test Case 1:
        string str1 = "m";
        Console.WriteLine(isValidGender(str1));

        // Test Case 2:
        string str2 = "f";
        Console.WriteLine(isValidGender(str2));

        // Test Case 3:
        string str3 = "F";
        Console.WriteLine(isValidGender(str3));

        // Test Case 4:
        string str4 = "M";
        Console.WriteLine(isValidGender(str4));

        // Test Case 5:
        string str5 = "FEMALE";
        Console.WriteLine(isValidGender(str5));

        // Test Case 6:
        string str6 = "S";
        Console.WriteLine(isValidGender(str6));

        // Test case 7:
        string str7 = "Not prefer to say";
        Console.WriteLine(isValidGender(str7));
    }
}


// This code is contributed by Pushpesh Raj.

Javascript

// Javascript program to validate
// GENDER using Regular Expression

// Function to validate the
// GENDER
function isValidGender(str) {
    // Regex to check valid
    // GENDER
    let regex = new RegExp(/(?:m|M|male|Male|f|F|female|Female|FEMALE|MALE|Not prefer to say)$/);

    // 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 = "m";
console.log(isValidGender(str1));

// Test Case 2:
let str2 = "f";
console.log(isValidGender(str2));

// Test Case 3:
let str3 = "F";
console.log(isValidGender(str3));

// Test Case 4:
let str4 = "M";
console.log(isValidGender(str4));

// Test Case 5:
let str5 = "FEMALE";
console.log(isValidGender(str5));

// Test Case 6:
let str6 = "S";
console.log(isValidGender(str6));

// Test Case 7:
let str7="Not prefer to say";
console.log(isValidGender(str7));


Output

true
true
true
true
true
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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