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### async_read_until

Start an asynchronous operation to read data into a streambuf until it contains a delimiter, matches a regular expression, or a function object indicates a match.

    template<
        typename AsyncReadStream,
        typename Allocator,
        typename ReadHandler>
    void async_read_until(
        AsyncReadStream & s,
        boost::asio::basic_streambuf< Allocator > & b,
        char delim,
        ReadHandler handler);

    template<
        typename AsyncReadStream,
        typename Allocator,
        typename ReadHandler>
    void async_read_until(
        AsyncReadStream & s,
        boost::asio::basic_streambuf< Allocator > & b,
        const std::string & delim,
        ReadHandler handler);

    template<
        typename AsyncReadStream,
        typename Allocator,
        typename ReadHandler>
    void async_read_until(
        AsyncReadStream & s,
        boost::asio::basic_streambuf< Allocator > & b,
        const boost::regex & expr,
        ReadHandler handler);

    template<
        typename AsyncReadStream,
        typename Allocator,
        typename MatchCondition,
        typename ReadHandler>
    void async_read_until(
        AsyncReadStream & s,
        boost::asio::basic_streambuf< Allocator > & b,
        MatchCondition match_condition,
        ReadHandler handler,
        typename boost::enable_if< is_match_condition< MatchCondition > >::type *  = 0);