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  1.     #include <iostream>
  2.     #include <regex>
  3.     using namespace std;
  4.  
  5.     int main() {
  6.         string str;
  7.         getline(cin, str);
  8.  
  9.         regex e("a+\\s+b+");
  10.  
  11.         if (regex_match(str,e)) 
  12.             cout<<"Matched";
  13.         else
  14.             cout<<"No Match";
  15.         return 0;
  16.     }
  17.  
Success #stdin #stdout 0s 5280KB
comments (?)
stdin 
a b
stdout 
Matched
https://ideone.com/FOmhEi
language:
C++14 (gcc 8.3)
created:
3 days ago
visibility:
public

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