A very practical guide to regular expressions. A worthwhile addition to the library of anyone working with manipulating text.
Topics covered include validation and formatting, words, numbers, internet codes, and markup languages with all the obvious and some of the not so obvious elements having at least one regular expression examined that can be useful when working with that element in text content. They don't just give you the regular expressions though, they also explain why they are written the way they are and how they work along with any shortcomings of a particular expression compared to alternatives.
This isn't a regular expression reference, it is a practical guide to regular expressions that shows not only what regular expressions might be suitable for your needs but which also helps you to learn why certain expressions are coded in particular ways in order to achieve the most efficient processing.