File Hunter is an effective and powerful text chain searcher within files. It lets you search multiple drives (including network drives), and multiple directories you previously select.
File Hunter finds any text chain type, and even does searches within compressed ZIP files. Once all the results have been obtained, it shows them in just one window. Of course, the searches can be filtered using set criteria (extension, date, size, attributes, text, etc).
The resulting lists can be ordered by the indications you specify, for example the number of times the same chain is repeated. In the File Hunter searches you can use logical operations (AND and OR) to make the searches more advanced.