Question

In the django book, and on the django website, \d+ is used to capture data from the url. The syntax is never explain, nor is the importance of D or the () beyond the fact that you can specify the number of characters in that part of the url. How, exactly/in what order, are these variables passed to the function? Hoe, exactly, does the syntax work? How do you implement it? Don’t forget to explain the ()

Answer 1

Without further information, I’d guess it’s a regular expression (or “regex” for short). These are a common string-processing mechanism used in many programming languages. In Python they are handled with the re module. If you want to learn more about them you might want to check out a general regex tutorial like http://www.regular-expressions.info/.