tailieunhanh - HandBooks Professional Java-C-Scrip-SQL part 62

Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 62', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Regex Summary That regular expressions are useful and important is not disputed and this library brings terrific regex power to C . Traditionally users have had few choices besides using the POSIX C APIs for regular expressions. For text-processing validation tasks regular expressions are much more scalable and reliable than handcrafted parsers. For searching and replacing there are a number of problems that are very elegantly solved using regular expressions but virtually impossible to solve without them. is a powerful library so it has not been possible to cover all of it in this chapter. Similarly the great expressiveness and range of application of regular expressions necessarily means that this chapter offers little more than an introduction to them. These topics could easily fill a separate book. To learn more study the online documentation for and pick up a book on regular expressions consult the Bibliography for suggestions . Despite the power of and the breadth and depth of regular expressions even complete neophytes can use regular expressions effectively with this library. For programmers who have selected other programming languages due to C s lack of support for regular expressions welcome home. is not the only regular expression library available for C programmers but it is certainly one of the best. It s easy to use and fast as lightning when matching your regular expressions. Use it as often as you can. The author of is Dr. John Maddock. How Does the Any Library Improve Your Programs Typesafe storage and safe retrieval of arbitrary types A means to store heterogeneous types in Standard Library containers Types are being passed through layers that need not know anything about the types The Any library provides a type any that allows for storage of any type for later retrieval without loss of type safety. It is like a variant type on steroids It will hold any type but you have to know the .