Book Image

C++20 STL Cookbook

By : Bill Weinman
Book Image

C++20 STL Cookbook

By: Bill Weinman

Overview of this book

Fast, efficient, and flexible, the C++ programming language has come a long way and is used in every area of the industry to solve many problems. The latest version C++20 will see programmers change the way they code as it brings a whole array of features enabling the quick deployment of applications. This book will get you up and running with using the STL in the best way possible. Beginning with new language features in C++20, this book will help you understand the language's mechanics and library features and offer insights into how they work. Unlike other books, the C++20 STL Cookbook takes an implementation-specific, problem-solution approach that will help you overcome hurdles quickly. You'll learn core STL concepts, such as containers, algorithms, utility classes, lambda expressions, iterators, and more, while working on real-world recipes. This book is a reference guide for using the C++ STL with its latest capabilities and exploring the cutting-edge features in functional programming and lambda expressions. By the end of the book C++20 book, you'll be able to leverage the latest C++ features and save time and effort while solving tasks elegantly using the STL.
Table of Contents (13 chapters)

Parse strings with Regular Expressions

Regular Expressions (commonly abbreviated as regex) are commonly used for lexical analysis and pattern-matching on streams of text. They are common in Unix text-processing utilities, such as grep, awk, and sed, and are an integral part of the Perl language. There are a few common variations in the syntax. A POSIX standard was approved in 1992, while other common variations include Perl and ECMAScript (JavaScript) dialects. The C++ regex library defaults to the ECMAScript dialect.

The regex library was first introduced to the STL with C++11. It can be very useful for finding patterns in text files.

To learn more about Regular Expression syntax and usage, I recommend the book, Mastering Regular Expressions by Jeffrey Friedl.

How to do it…

For this recipe, we will extract hyperlinks from an HTML file. A hyperlink is coded in HTML like this:

<a href="">Text goes here</a>