C＃搜索字符串中的单词出现

Question

How can I search for a word within a string ? I have one text box which the user insert a string and another on with with text just some random text. Are there any alterative ways of doing this besides using regex and IndexOf ? Like using a for loop and checking the length and character in the word.

This is what I tried so far

        int i = 0; 
        int count = 0;

        input2.Trim(); 

        while ((i = input2.IndexOf(input1, i)) != -1) 
        {
            i = i + input1.Length;
            count++; 
        }

        MessageBox.Show(count.ToString() + " Matches Found");

Answer 1

Looks like you want to get the Count of search string in the text. You can try the following.

string searchString = "TEST";
string completeText = "Some sentence TEST with other words incluing TEST";
int count = completeText.Split(new string[]{"TEST"},StringSplitOptions.None)
                        .Count() - 1;
MessageBox.Show(count.ToString() + " Matches Found");

Answer 2

Use a regex to match the number of occurances,

string test = "THE DOG WENT TO TOWN DOG";
int j = Regex.Matches(test, "DOG").Cast<Match>().Count();