A selection can be saved with a name, so that you can refer to it later in other patterns.
You can save the current selection with a name by clicking on the little Name... button above the list of names at right. The Name button pops up a dialog box asking for a name:
Try the following exercise to see how the Name button works. First, make a simple selection by entering this pattern into the Pattern box and pressing Go. (If you're tired of pressing the Go button, you can use a keyboard shortcut, Control-Enter, to do the same thing. Similarly, the keyboard shortcut for the Clear button is the Escape key.)
Then press the Name button, and type Pronoun as the name for the selection. After you click OK, you should see Pronoun appear in the list of names. (Note: a more complete definition for Pronoun would selection not only you, but also other pronouns like I, he, she, and it. We'll see how to write more sophisticated patterns shortly.)
You can also name a selection by using the word is in a pattern. For example, typing the following pattern into the Pattern box would have the same effect as the steps you did above:
Names should not contain spaces or quotes, but otherwise you're free to choose any names you like. Uppercase or lowercase doesn't matter, so Pronoun means the same as pronoun and PRONOUN.