Start up Regetron again and type this in:
Enter each of these lines as commands to regetron, and make sure you get them right.
Compare what you get for output with what I have below and make sure it's the same.
I've skipped showing you my entire shell session for starting Regetron here, and won't show it unless it matters to the exercise. Just assume that I started Regetron and entered this text in at the ``> `` prompts, then it printed the response under it.
What Regetron does is take what you type, convert it to a regular expression, and then runs that regular expression on each line. In the above we set the data to these two lines:
The lazy dog sleeps in the yard.
If a regular expression matches a line, then it gets printed. In the above you can see the first line gets matched twice, and the second only by the last regular expression.