This operation tests if the first entry contains the argument. The substring of text should match the sequence of characters of the first entry exactly, including case. This search respects the order of the words in the entry. For example, searching for 'cat', 'hat', 'cat in', 'cat in the', 'in the hat', 'at in', or 'cat in the hat' would all return the phrase 'the cat in the hat'. However, searching for 'cat the hat', 'cat hat', or 'Cat' would not return 'the cat in the hat'. This search is useful for returning exact matches for partial words, like searching 'pepp' and returning 'peppers'.