Read data into a dynamic buffer sequence, or into a streambuf, until it contains a delimiter, matches a regular expression, or a function object indicates a match.

template<
    typename SyncReadStream,
    typename DynamicBuffer>
std::size_t read_until(
    SyncReadStream & s,
    DynamicBuffer && buffers,
    char delim);
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template<
    typename SyncReadStream,
    typename DynamicBuffer>
std::size_t read_until(
    SyncReadStream & s,
    DynamicBuffer && buffers,
    char delim,
    std::error_code & ec);
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template<
    typename SyncReadStream,
    typename DynamicBuffer>
std::size_t read_until(
    SyncReadStream & s,
    DynamicBuffer && buffers,
    string_view delim);
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template<
    typename SyncReadStream,
    typename DynamicBuffer>
std::size_t read_until(
    SyncReadStream & s,
    DynamicBuffer && buffers,
    string_view delim,
    std::error_code & ec);
  » more...