def convert_text_to_varname(text):
    r"""
    Args:
        text (str): text that might not be a valid variablename

    Returns:
        str: varname

    CommandLine:
        python -m utool.util_regex --test-convert_text_to_varname

    Example:
        >>> # DISABLE_DOCTEST
        >>> from utool.util_regex import *  # NOQA
        >>> text = '0) View Application-Files Directory. '
        >>> varname = convert_text_to_varname(text)
        >>> result = ('varname = %s' % (str(varname),))
        >>> print(result)
        _0_View_ApplicationFiles_Directory_
    """
    varname_pattern = '[^a-zA-Z0-9_]'
    varname = text
    # Convert spaces to underscores
    varname = varname.replace(' ', '_')
    # Remove all other non-varname chars
    varname = re.sub(varname_pattern, '', varname)
    # Make sure there are not leading numbers
    if re.match('^[0-9]', varname):
        varname = '_' + varname
    assert re.match(REGEX_VARNAME, varname), 'invalid varname=%r' % (varname,)
    return varname