String format check

I have a vector of strings that are working and I need to check how the string is formed. I am using sscanf in the rest of the function and I need something like this.

if (format("%f,%f,%f")) {
  // Do someting
} else if (format("%d,%d")) {
  // Do something else
} else {
  // Do something
}

      

        
        
        
      

    

Can sscanf or something else be used from std?