我找不到std::regex
庫的參考。我做了一些谷歌搜索,並找到了一些教程,但它們都很簡短。我無法弄清楚如何使用正則表達式來標記字符串。如何在Visual Studio 2010中使用std :: regex庫標記字符串?
任何人都可以給我一個提示如何開始?
我找不到std::regex
庫的參考。我做了一些谷歌搜索,並找到了一些教程,但它們都很簡短。我無法弄清楚如何使用正則表達式來標記字符串。如何在Visual Studio 2010中使用std :: regex庫標記字符串?
任何人都可以給我一個提示如何開始?
我認爲自boost ::正則表達式網站的例子可以解決我的問題;)
/*
*
* Copyright (c) 12003
* John Maddock
*
* Use, modification and distribution are subject to the
* Boost Software License, Version 1.0. (See accompanying file
* LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
*
*/
/*
* LOCATION: see http://www.boost.org for most recent version.
* FILE regex_token_iterator_example_1.cpp
* VERSION see <boost/version.hpp>
* DESCRIPTION: regex_token_iterator example: split a string into tokens.
*/
#include <boost/regex.hpp>
#include <iostream>
using namespace std;
#if defined(BOOST_MSVC) || (defined(__BORLANDC__) && (__BORLANDC__ == 0x550))
//
// problem with std::getline under MSVC6sp3
istream& getline(istream& is, std::string& s)
{
s.erase();
char c = static_cast<char>(is.get());
while(c != '\n')
{
s.append(1, c);
c = static_cast<char>(is.get());
}
return is;
}
#endif
int main(int argc, const char*[])
{
string s;
do{
if(argc == 1)
{
cout << "Enter text to split (or \"quit\" to exit): ";
getline(cin, s);
if(s == "quit") break;
}
else
s = "This is a string of tokens";
boost::regex re("\\s+");
boost::sregex_token_iterator i(s.begin(), s.end(), re, -1);
boost::sregex_token_iterator j;
unsigned count = 0;
while(i != j)
{
cout << *i++ << endl;
count++;
}
cout << "There were " << count << " tokens found." << endl;
}while(argc == 1);
return 0;
}
一個video tutorial對STL正則表達式。
#include <regex>
#include <iostream>
#include <string>
void ifIWantASpecificMatch()
{
const std::string input = "Hello World";
const std::regex regex("(.*) (.*)");
std::smatch match; // std::match_result ready templated for std::string
if (std::regex_match(input, match, regex)) {
std::cout << "full match " << match[0] << std::endl;
std::cout << "first group " << match[1] <<
" beginning at: " << match[1].first - input.begin() << std::endl;
std::cout << "second group " << match[2] <<
" beginning at: " << match[2].first - input.begin() << std::endl;
}
}
void ifIWantToIterateAllMatches()
{
const std::string input = "I want to get all the o's";
const std::regex regex("o");
std::smatch match;
for (std::sregex_iterator it(input.begin(), input.end(), regex), end; it != end; ++it) {
std::cout << "Found at: " << it->position() << std::endl;
}
}
請將您的第二個問題作爲一個單獨的問題發佈。 – 2010-12-22 18:19:04