iterator begin() noexcept;
const_iterator begin() const noexcept;
const_iterator cbegin() const noexcept;
Returns an iterator to the beginning of the list of sub-matches. If match was successful, the iterator will point to the entire matched expression.
 Return value
Iterator to the first sub-match.
 See also
| returns iterator to the end of the list of sub-matches |
(public member function)