(C++) Boost.Regex example 1

Boost.Regex example 1 is a example how to use the Boost.Regex library.

The example below shows how to define a regular expression for a Dutch zip code, how to check for it and how to search for it.

Download the Qt Creator project 'CppRegexExample1' (zip)

Operating system: Ubuntu 10.04 LTS Lucid Lynx

IDE: Qt Creator 2.0.0

Project type: Qt4 Console Application

Compiler: G++ 4.4.1

Libraries used:

Boost: version 1.40
STL: from GCC, shipped with Qt Creator 2.0.0

Qt project file


#-------------------------------------------------

#

# Project created by QtCreator 2010-08-06T15:52:11

#

#-------------------------------------------------

QT       += core

QT       -= gui

TARGET = CppRegexExample1

CONFIG   += console

CONFIG   -= app_bundle

TEMPLATE = app

LIBS += -L/usr/local/lib -lboost_regex

SOURCES += main.cpp

Source code

main.cpp


#include <cassert>

#include <string>

#include <boost/regex.hpp>



int main()

{

  //Define how a dutch zip code is formatted

  const boost::regex dutch_zip_code("\\d{4}\\s[A-Z]{2}");



  //Check if the regex works properly

  assert(boost::regex_match("1234 AB",dutch_zip_code)==true);

  assert(boost::regex_match("1234 ab",dutch_zip_code)==false);

  assert(boost::regex_match("1234ab",dutch_zip_code)==false);



  //Define a sentence with a Dutch zip code in it

  const std::string s = "My Dutch zip code is 1234 AB.";



  //Show how boost::regex_match and boost::regex_search work

  assert(boost::regex_match(s,dutch_zip_code)==false

    && "the std::string does not match a dutch zip code");

  assert(boost::regex_search(s,dutch_zip_code)==true

    && "but the std::string does contain a dutch zip code");



  //Show how to obtain a Dutch zip code from a std::string

  const boost::sregex_iterator i(s.begin(),s.end(),dutch_zip_code);

  const std::string t = i->str();

  assert(t=="1234 AB");

}

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