在 C++ 中检索正则表达式搜索
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Retrieving a regex search in C++
提问by RDismyname
Hello I am new to regular expressions and from what I understood from the c++ reference website it is possible to get match results.
您好，我是正则表达式的新手，根据我从 c++ 参考网站的理解，可以获得匹配结果。
My question is: how do I retrieve these results? What is the difference between smatchand cmatch? For example, I have a string consisting of date and time and this is the regular expression I wrote:
我的问题是：如何检索这些结果？smatch和 和有cmatch什么区别？例如，我有一个由日期和时间组成的字符串，这是我编写的正则表达式：
"(1[0-2]|0?[1-9])([:][0-5][0-9])?(am|pm)"
Now when I do a regex_searchwith the string and the above expression, I can find whether there is a time in the string or not. But I want to store that time in a structure so I can separate hours and minutes. I am using Visual studio 2010 c++.
现在当我regex_search对字符串和上面的表达式做 a时，我可以找到字符串中是否有时间。但我想把那个时间存储在一个结构中，这样我就可以分开小时和分钟。我正在使用 Visual Studio 2010 C++。
回答by Some programmer dude
If you use e.g. std::regex_searchthen it fills in a std::match_resultwhere you can use the operator[]to get the matched strings.
如果您使用 eg ，std::regex_search那么它会填入一个std::match_result您可以使用operator[]来获取匹配字符串的地方。
Edit:Example program:
编辑：示例程序：
#include <iostream>
#include <string>
#include <regex>
void test_regex_search(const std::string& input)
{
std::regex rgx("((1[0-2])|(0?[1-9])):([0-5][0-9])((am)|(pm))");
std::smatch match;
if (std::regex_search(input.begin(), input.end(), match, rgx))
{
std::cout << "Match\n";
//for (auto m : match)
// std::cout << " submatch " << m << '\n';
std::cout << "match[1] = " << match[1] << '\n';
std::cout << "match[4] = " << match[4] << '\n';
std::cout << "match[5] = " << match[5] << '\n';
}
else
std::cout << "No match\n";
}
int main()
{
const std::string time1 = "9:45pm";
const std::string time2 = "11:53am";
test_regex_search(time1);
test_regex_search(time2);
}
Output from the program:
程序的输出：
Match match[1] = 9 match[4] = 45 match[5] = pm Match match[1] = 11 match[4] = 53 match[5] = am
回答by kuperspb
Just use named groups.
只需使用命名组。
(?<hour>(1[0-2]|0?[1-9]))([:](?<minute>[0-5][0-9]))?(am|pm)
Ok, vs2010 doesn't support named groups. You already using unnamed capture groups. Go through them.
好的，vs2010 不支持命名组。您已经在使用未命名的捕获组。通过他们。
