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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def sanitize_ltsv_label(label, replacement_text=""):
 """ Replace all of the symbols in text. :param str label: Input text. :param str replacement_text: Replacement text. :return: A replacement string. :rtype: str """


    validate_null_string(label, error_msg="label is empty")

    return __RE_INVALID_LTSV_LABEL.sub(replacement_text, preprocess(label))