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The C++ Standard Library

You're reading from   The C++ Standard Library What every professional C++ programmer should know about the C++ standard library.

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Product type Paperback
Published in Dec 2019
Publisher
ISBN-13 9781838981129
Length 251 pages
Edition 2nd Edition
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Author (1):
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Rainer Grimm Rainer Grimm
Author Profile Icon Rainer Grimm
Rainer Grimm
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Toc

Table of Contents (19) Chapters Close

Reader Testimonials FREE CHAPTER Introduction 1. The Standard Library 2. Utilities 3. Interface of All Containers 4. Sequential Containers 5. Associative Container 6. Adaptors for Containers 7. Iterators 8. Callable Units 9. Algorithms 10. Numeric 11. Strings 12. String Views 13. Regular Expressions 14. Input and Output Streams 15. Filesystem library 16. Multithreading Index

Regular Expression Objects

Objects of type regular expression are instances of the class template template <class charT, class traits= regex_traits <charT>> class basic_regex parametrized by their character type and traits class. The traits class defines the interpretation of the properties of the regular grammar. There are two type synonyms in C++:

typedef basic_regex<char> regex;
typedef basic_regex<wchar_t> wregex;

You can further customise the object of type regular expression. Therefore you can specify the used grammar or adapt the syntax. As said before, C++ supports the basic, extended, awk, grep and egrep grammars. A regular expression qualified by the std::regex_constants::icase flag is case insensitive. If you want to adopt the syntax, you have to specify the grammar explicitly.

Specify the grammar
// regexGrammar.cpp 
...
#include <regex>
...
using std::regex_constants::ECMAScript;
using std::regex_constants::icase;

std::string theQuestion...
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