Advanced Topics 16. Counting a Word in a Text

// Write a program that counts how many times a given word occurs in given text. The first line in the input holds the word. The second line of the input holds the text. The output should be a single integer number – the number of word occurrences. Matching should be case-insensitive. Note that not all matching substrings are words and should be counted. A word is a sequence of letters separated by punctuation or start / end of text.

namespace _16.CountingWordInText
{
    using System;

    public class CountingWordInText
    {
        public static void Main(string[] args)
        {
            checked
            {
                Console.Write("Enter your counting Word: ");
                string countingWord = Console.ReadLine();
                Console.WriteLine("Enter your holds Text on single line!");
                string inputText = Console.ReadLine();
                if (countingWord != string.Empty && inputText != string.Empty)
                {
                    char[] separators = new char[] { ' ', ',', ';', '-', ':', '"', '\'', '(', ')', '/', '!', '?', '.', '$', '@', '#', '%', '&', '\\', '[', ']', '{', '}', '|', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '*', '=' };
                    string[] text = inputText.Split(separators, StringSplitOptions.RemoveEmptyEntries);
                    int countWord = 0;
                    for (int i = 0; i < text.Length; i++)
                    {
                        string currentWord = text[i];
                        bool isEquals = countingWord.Equals(currentWord, StringComparison.OrdinalIgnoreCase);
                        if (isEquals)
                        {
                            countWord++;
                        }
                    }

                    Console.WriteLine("The Given word occurs in given text {0} times !", countWord);
                }
                else
                {
                    Console.WriteLine("Error! - Invalid Input!!!");
                }
            }
        }
    }
}