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In STL, when I do s.find(""), it returns 0 while s.find_first_of("") returns -1 (npos). What is the reason for this difference?
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The difference is that while find searches for one particular value, find_first_of searches for any of several values. Specifically, find_first_of searches for the first occurrence in the range [first1, last1) of any of the elements in [first2, last2) .
In this tutorial, we will learn about the Python String find() method with the help of examples. The find() method returns the index of first occurrence of the substring (if found). If not found, it returns -1.
The C++ function std::algorithm::find_first_of() returns an iterator to the first element in the range of (first1,last1) that matches any of the elements in first2,last2. If no such element is found, the function returns last1.
string find in C++ String find is used to find the first occurrence of sub-string in the specified string being called upon. It returns the index of the first occurrence of the substring in the string from given starting position. The default value of starting position is 0.
s.find(t) finds the first occurrence of the substring t in s. If t is empty, then that occurrence is at the beginning of s, and s.find(t) will return 0.
s.find_first_of(t) finds the first occurrence of one of the characters in t. If t is the empty string, then there are no characters in t, so no occurrence can be found, and find_first_of will return npos.
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