copying a substring from a string given end index in string

Question

How can I copy a substring from a given string with start and end index or giving the start index and length of the string are given.

Answer 1

std::string thesub = thestring.substr(start, length);

or

std::string thesub = thestring.substr(start, end-start+1);

assuming you want the endth character to be included in the substring.