# operator<<(std::sub_match)

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< cpp‎ | regex‎ | sub match

template< class CharT, class Traits, class BidirIt > std::basic_ostream <CharT,Traits>& operator<<( std::basic_ostream <CharT,Traits>& os, const sub_match<BidirIt>& m ); |  | (since C++11)

Writes the representation of the matched subsequence `m` to the output stream `os`.

Equivalent to os << m.str().

### Parameters

os | - | output stream to write the representation to
m | - | a sub-match object to output

### Return value

`os`.

### Example

| This section is incomplete Reason: no example

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