human
Solve the following python programming problem given the following code:
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:: yaml

    >>> import re
    >>> from salt.utils import *
    >>> regex = build_whitespace_split_regex(
    ...     """if [-z "$debian_chroot"] && [-r /etc/debian_chroot].
then"""
    ...)

    >>> 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 ("'" in text) : 
            lexer.quotes = '"' 
else : 
            if ('"' in text) : 
                lexer.quotes = "'" 
return list (lexer) 
regex = '' 
    for line in text.splitlines () : 
        parts = [re.escape (s) for s in __build_parts (line)] 
        regex += '(?:[\\s]+)?{0}(?:[\\s]+)?'.format ('(?:[\\s]+)?'.join (parts)) 
return '(?m)^{0}$'.format (__build_parts) 

    
    

    Fix the buggy line: return '(?m)^{0}$'.format (__build_parts)
assistant
#Here is Python program to fix the buggy line: return '(.

return '(?m)^{0}$'.format (regex)