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 ...
Get Eloquent Ruby now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.