[英]C++ find specific number in a string
I'm quite new to regular expressions. 我对正则表达式很陌生。 I have this string. 我有这个字符串。
string s = media_type=video|key_frame=1|pkt_pts=1516999|pkt_pts_time=50.566633|pkt_dts=1516999|
I need to get 50.566633 value extracted using string operators and regular expressions in C++. 我需要使用C ++中的字符串运算符和正则表达式来提取50.566633值。 Can some one suggest a way to do this? 有人可以建议一种方法吗?
Regex is well worth studying because it is so useful. 正则表达式非常有用,因为它非常有用。
This works for me: 这对我有用:
#include <regex>
#include <iostream>
std::string s = "media_type=video|key_frame=1|pkt_pts=1516999|pkt_pts_time=50.566633|pkt_dts=1516999|";
int main()
{
// parens () define a capture group to extract your value
// so the important part here is ([^|]*)
// - capture any number of anything that is not a |
std::regex rx("pkt_pts_time=([^|]*)");
std::smatch m;
if(std::regex_search(s, m, r))
std::cout << m.str(1); // first captured group
}
Click on Working Example 单击工作示例
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