Preditor is a class for file editing and copying. It makes editing easier by allowing you to load a file, enter a piece (string) you want changed, and a replacement string, whether it only occurs once, or a bunch of times, and it will go through the file and change each occurence. You can also save the file to a directory, or copy non-text-based files to different directories.
Plato is a PHP-based template parsing engine which uses both regular expressions and string replacement functions. It is very extensible and allows users to create their own plugins. It has the ability to insert variables, include files, make function calls to plugins, and perform loops.