package bufio
ReadBytes reads until the first occurrence of delimiter in the input, returning a slice containing the data up to and including the delimiter. If ReadBytes encounters an error before finding a delimiter, it returns the data read before the error and the error itself (often io.EOF). ReadBytes returns err != nil if and only if the returned data does not end in delimiter. For simple uses, a Scanner may be more convenient.
Golang bufio.ReadBytes() function usage example
readbuffer := bytes.NewBuffer([]byte("abcd#fg"))
reader := bufio.NewReader(readbuffer)
buffer, err := reader.ReadBytes('#') // # is our delimiter
fmt.Printf("%s \n", string(buffer))
Output :
abcd
