When you've crafted a PowerGREP action, store the action into your own PowerGREP library. Later, you can easily search and instantly reuse any action you've saved into your library.
Each library can hold an unlimited number of PowerGREP search terms, actions, file selections, sequences. You can give each item a detailed caption and description, and conveniently search both the caption and description to find the action you need later. It's perfectly possible, and even a good idea, to store each variation of every action you've ever used into your library, and make note of the difference in the description.
When you buy PowerGREP, you also get a library of actions that you can use for a wide range of purposes. The actions and regular expressions in the example library are described in detail in PowerGREP's help file. They cover almost all aspects of PowerGREP's functionality.
Be sure to check out all the examples in the help file. I'm sure you will be surprised at PowerGREP's versatility. With a bit of practice, you will be able to easily perform many search or text processing tasks that would be tedious or not even worth the effort without PowerGREP.