To check if a cell contains specific text, you can use the SEARCH function together with the ISNUMBER function. In the generic version, substring is the specific text you are looking for, and text represents text in the cell you are checking.
This formula returns TRUE if the substring is found, and FALSE if not.
Note: the SEARCH function will automatically find partial matches.
How the formula works
The SEARCH function returns the position of the search string when found, and the #VALUE! error if not. We use this fact to test when the search string is found by using the ISNUMBER function to "catch" valid numeric positions.
ISNUMBER returns TRUE for numbers and FALSE for anything else. So, if SEARCH finds the substring, it returns the position as a number, and ISNUMBER returns TRUE. If SEARCH doesn't find the substring, it returns a #VALUE! error, which causes the ISNUMBER to return FALSE.
Case sensitive version
If you want this formula to be case-sensitive, you can replace the SEARCH function with the FIND function like so:
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