[英]How do I use the new c++0x regex object to match repeatedly within a string?
I have a string: 我有一个字符串:
"hello 1, hello 2, hello 17, and done!"
And I want to apply this regular expression repeatedly to it: 我想重复应用这个正则表达式:
hello ([0-9]+)
And be able to iterate through the matches and their capture groups somehow. 并能够以某种方式迭代匹配和他们的捕获组。 I've used the "regex" stuff successfully in c++0x to find the first match for something in a string and inspect the contents of the capture group; 我已经在c ++ 0x中成功地使用了“正则表达式”的东西来找到字符串中某些东西的第一个匹配并检查捕获组的内容; however, I'm not sure how to do this multiple times on a string until all the matches are found. 但是,我不确定如何在字符串上多次执行此操作,直到找到所有匹配项。 Help! 救命!
(Platform is visual studio 2010, in case it matters.) (平台是视觉工作室2010,万一重要。)
Don't use regex_match, use regex_search. 不要使用regex_match,请使用regex_search。 You can find examples here: http://www.codeguru.com/cpp/cpp/cpp_mfc/stl/article.php/c15339 . 您可以在此处找到示例: http : //www.codeguru.com/cpp/cpp/cpp_mfc/stl/article.php/c15339 。
This should do the trick (notice I'm typing directly in the browser, didn't compile it): 这应该是诀窍(注意我直接在浏览器中输入,没有编译它):
#include <iostream>
#include <regex>
int main()
{
// regular expression
const std::regex pattern("hello ([0-9]+)");
// the source text
std::string text = "hello 1, hello 2, hello 17, and done!";
const std::sregex_token_iterator end;
for (std::sregex_token_iterator i(text.cbegin(), text.cend(), pattern);
i != end;
++i)
{
std::cout << *i << std::endl;
}
return 0;
}
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