<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def build_whitespace_split_regex(text):
 ''' Create a regular expression at runtime which should match ignoring the addition or deletion of white space or line breaks, unless between commas Example: .. code-block:: python 

        ... )

        >>> regex
        '(?:[\\s]+)?if(?:[\\s]+)?\\[(?:[\\s]+)?\\-z(?:[\\s]+)?\\"\\$debian'
        '\\_chroot\\"(?:[\\s]+)?\\](?:[\\s]+)?\\&\\&(?:[\\s]+)?\\[(?:[\\s]+)?'
        '\\-r(?:[\\s]+)?\\/etc\\/debian\\_chroot(?:[\\s]+)?\\]\\;(?:[\\s]+)?'
        'then(?:[\\s]+)?'
        >>> re.search(
        ...     regex,
        ...     """if [ -z "$debian_chroot" ] && [ -r /etc/debian_chroot ]; then"""
        ... )

        <_sre.SRE_Match object at 0xb70639c0>
        >>>

    '''
    def __build_parts(text):
        lexer = shlex.shlex(text)
        lexer.whitespace_split = True
        lexer.commenters = ''
        if r"'\"" in text:
            lexer.quotes = ''
        elif '\'' in text:
            lexer.quotes = '"'
        elif '"' in text:
            lexer.quotes = '\''
        return list(lexer)

    regex = r''
    for line in text.splitlines():
        parts = [re.escape(s) for s in __build_parts(line)]
        regex += r'(?:[\s]+)?{0}(?:[\s]+)?'.format(r'(?:[\s]+)?'.join(parts))
    return r'(?m)^{0}$'.format(regex)