[英]‘multiline’ is not a member of ‘std::__cxx11::regex’
我正在嘗試使用以下命令編譯以下C ++代碼:
g++ -std=c++17 -o rgx rgx.cpp
#include <iostream>
#include <regex>
#include <string>
using namespace std;
int main() {
regex rgx("^([A-Z]*)$", regex::ECMAScript | regex::multiline | regex::icase);
smatch rmtch;
string str = "AbcefgH\r\nTest";
if (regex_match(str, rmtch, rgx)) {
for (size_t i = 0; i < rmtch.size(); i++) {
ssub_match smtch = rmtch[i];
string s_m = smtch.str();
cout << " submatch " << i << ": " << s_m << endl;
}
}
return 0;
};
但是得到以下編譯時錯誤
rgx.cpp: In function ‘int main()’:
rgx.cpp:7:53: error: ‘multiline’ is not a member of ‘std::__cxx11::regex’ {aka ‘std::__cxx11::basic_regex<char>’}
7 | regex rgx("^([A-Z]*)$", regex::ECMAScript | regex::multiline | regex::icase);
g++ --version
g++ (Ubuntu 9.1.0-8ubuntu1) 9.1.0
當我指定-std = c ++ 17時,為什么g ++使用__cxx11 :: regex?
cppreference.com/w/cpp/regex/basic_regex將regex::multiline
定義為C++17
標准的一部分
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