How to String replace text/Find and replace text for multiple files with regular expressions

Using this software, you can easily and automatically find and replace text in a single, multiple, or selected files using simple or regular (regex) expressions. To start, simply select a file, any number of files, or recursively scan directories with wildcards. Then, you can enter multiple find/search and replace statements and order them how they should act on the file. (You can even save these set of instructions to use later, as a batch job on a set of files).

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help me i dotn understand how i can do a application that change the text string from a programm to something that i want to!