ReadUntilRegex

read.go

func ReadUntilRegex(r io.Reader, regex string) (string, error) {
	accumulated := []byte{}
	reg, err := regexp.Compile(regex)
	if err != nil {
		return "", nil
	}
	for {
		buf := make([]byte, 16*1024)
		n, err := r.Read(buf)
		if err != nil && err != io.EOF {
			return "", err
		}
		accumulated = append(accumulated, buf[:n]...)
		if err == io.EOF {
			return string(accumulated), err
		}
		if reg.Match(accumulated) {
			return string(accumulated), nil
		}
	}
}