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Source Code
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#include <iostream>
#include <string>
#include <regex>
using namespace std;
int main(){
try{ string rs1 = "[+\\-*=/!]"; cout<<rs1<<" --> "; regex re( rs1 ); } catch (std::regex_error r) {
cout<<"The error is: "<<r.what();
}
try{ string rs2 = "[+\\-]"; cout<<"\n"<<rs2<<" --> "; regex re( rs2 ); } catch (std::regex_error r) {
cout<<"The error is: "<<r.what();
}
try{
string rs3 = "[\\-+]"; cout<<"\n"<<rs3<<" --> "; regex re( rs3 ); } catch (std::regex_error r) {
cout<<"The error is: "<<r.what();
}
try{
string rs4 = "[+-]"; cout<<"\n"<<rs4<<" --> "; regex re( rs4 ); } catch (std::regex_error r) {
cout<<"The error is: "<<r.what();
}
try{
string rs5 = "[-+]"; cout<<"\n"<<rs5<<" --> "; regex re( rs5 ); } catch (std::regex_error r) {
cout<<"The error is: "<<r.what();
}
try{ string rs6 = "[-+*=/!]"; cout<<"\n"<<rs6<<" --> "; regex re( rs6 ); } catch (std::regex_error r) {
cout<<"The error is: "<<r.what();
}
return 0;
}
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Text
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