Program to find all match of a regex in a string

Prerequisite: smatch | Regex (Regular Expressions) in C++ Given a regex, the task is to find all regex matches in a string.

Without using iterator: 

Implementation:

Matched string is GeeksforGeeks
and it is found at position 3

Matched string is GeeksforGeeks
and it is found at position 7

Matched string is GeeksforGeeks
and it is found at position 14

• Note: Above code is running perfectly fine but the problem is input string will be lost.
• Using iterator: Object can be constructed by calling the constructor with three parameters: a string iterator indicating the starting position of the search, a string iterator indicating the ending position of the search, and the regex object. Construct another iterator object using the default constructor to get an end-of-sequence iterator. 

Implementation: