std::match_results<BidirIt,Alloc>::operator[] - cppreference.com (original) (raw)

| const_reference operator[]( size_type n ) const; | | (since C++11) | | ---------------------------------------------------- | | ------------- |

If n > 0 and n < size(), returns a reference to the std::sub_match representing the part of the target sequence that was matched by the nth captured marked subexpression).

If n == 0, returns a reference to the std::sub_match representing the part of the target sequence matched by the entire matched regular expression.

if n >= size(), returns a reference to a std::sub_match representing an unmatched sub-expression (an empty subrange of the target sequence).

ready() must be true. Otherwise, the behavior is undefined.

[edit] Parameters

[edit] Return value

Reference to the std::sub_match representing the specified matched subrange within the target sequence.

[edit] Example

Output:

entire match: aaab submatch #1: a entire match: aaab submatch #1: aa

[edit] See also

| | returns the sequence of characters for the particular sub-match (public member function) [edit] | | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |