C# Sharp Exercises: Find a specific word in a string

Last update on August 25 2025 12:53:05 (UTC/GMT +8 hours)

Write a C# Sharp program to locate the word “C#” in a given string. If the word "C#" is found, return “C# document found.” otherwise return “Sorry no C# document!”.

Sample Data:
("C# Exercises") -> "C# document found."
("Python Exercises") -> "Sorry no C# document!"
("Tutorial on c#") -> "C# document found."

Sample Solution:

C# Sharp Code:

using System;
using System.Text.RegularExpressions;

namespace exercises
{
    class Program
    {
        // Main method - entry point of the program
        static void Main(string[] args)
        {
            // Define and initialize test strings
            string text = "C# Exercises";
            Console.WriteLine("Original string: " + text);

            // Call the test method and display the result
            Console.WriteLine(test(text));

            // Update the test string
            text = "Python Exercises";
            Console.WriteLine("\nOriginal string: " + text);

            // Call the test method and display the result
            Console.WriteLine(test(text));

            // Update the test string
            text = "Tutorial on c#";
            Console.WriteLine("\nOriginal string: " + text);

            // Call the test method and display the result
            Console.WriteLine(test(text));
        }

        // Method to check if the given text contains the term "C#" (case insensitive)
        public static string test(string text)
        {
            // Check if the text contains the term "C#" (case insensitive)
            bool flag = Regex.IsMatch(text, Regex.Escape("C#"), RegexOptions.IgnoreCase);

            // Return different messages based on the presence of the term
            if (flag)
            {
                return "C# document found.";
            }
            return "Sorry no C# document!";
        }
    }
}

Sample Output:

Original string: C# Exercises
C# document found.

Original string: Python Exercises
Sorry no C# document!

Original string: Tutorial on c#
C# document found.

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