This method will introduce two formulas to check/find if the specific string existing or nor in a cell, and return the string’s position.

Check and find if containing the specific string with formula

Select a blank cell you will return the checking result, and enter below formula into it, and then drag the Fill Handle to the range as you need. See screenshot:

=ISNUMBER(SEARCH("KTE",A2))

Find certain string and return its position with formula

Select a blank cell you will return the specific string’s position, and enter below formula into it, and then drag the Fill Handle to the range as you need. See screenshot:

=FIND( "KTE",A2)

Kutools for Excel’s Count times a word appears formula can not only check if a string exists in a cell or not, but also count the occurrences of this string.

1. Select a blank cell you will return the counting result, and click the Kutools > Formula Helper > Formula Helper.

2. In the opening Formula Helper dialog box, please do as follows:
(1) Select Statistical from the Formula Type drop-down list;
(2) Click to select Count the number of a word in the Choose a formula list box;
(3) Specify the cell address where you will count occurrences of the specific string into the Text box;
(4) Type the specific string into the Word box.

3. Click the Ok button to apply this formula. Then drag the Fill Handle to the range as you need. See screenshot:

If you have Kutools for Excel installed, you can apply its Select Specific Cells feature to quickly look for a certain value from a range, and count the occurrences if it exists in Excel. Please do as follows:

1. Select the column you will find in, and click Kutools > Select > Select Specific Cells. See screenshot below:

2. In the opening Select Specific Cells dialog box, please check the Cell option, select Contains from the first drop down list in the Specific type section, and type the certain value you will find into following box. See screenshot above:

3. Click the Ok button.

And now cells containing the certain value are selected at once, and simultaneously a dialog box will come out and show how many cells are selected.