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Is gcc 4.8 or earlier buggy about regular expressions?2
尝试学习如何在C 11中使用新的std :: regex.但是我尝试的例子是抛出一个我不明白的regex_error异常.这是我的示例代码：
尝试学习如何在C 11中使用新的std :: regex.但是我尝试的例子是抛出一个我不明白的regex_error异常.这是我的示例代码：
#include <iostream>
#include <regex>
int main()
{
std::string str = "xyzabc1xyzabc2xyzabc3abc4xyz";
std::regex re( "(abc[1234])" ); // <-- this line throws a C++ exception
// also tried to do this:
// std::regex re( "(abc[1234])",std::regex::optimize | std::regex::extended );
while ( true )
{
std::cout << "searching in " << str << std::endl;
std::smatch match;
std::regex_search( str,match,re );
if ( match.empty() )
{
std::cout << "...no more matches" << std::endl;
break;
}
for ( auto x : match )
{
std::cout << "found: " << x << std::endl;
}
str = match.suffix().str();
}
return 0;
}
我编译并运行如下：
g++ -g -std=c++11 test.cpp ./a.out terminate called after throwing an instance of 'std::regex_error' what(): regex_error
看看gdb中的backtrace,我看到抛出的异常是regex_constants :: error_brack.
