Chapter 5. Find the Right String with Regular Expressions
I’d like to pose a problem for you: Imagine that you have some text stored in a string, and somewhere in that text hides a time, something like
09:24 AM. You need to write a program that will locate the time. How do you do it? You might, using the methods we talked about in the last chapter, scan the string for a digit and then check to see whether it is followed by another digit and then see whether that is followed by a colon, then two more digits . . . well, you get the picture. Doing all this with the
String methods is certainly possible. Tedious, but possible.
Sometimes a problem speaks to you. This time-finding problem is trying to tell you that you are using the wrong tool. The ...