human
Solve the following python programming problem given the following code:
def _strip_regex(pattern, text, preserve_lines) : 
    'Generic function that strips out comments pased on the given pattern.' 
    def remove_comments(group, preserve_lines = False) : 
        'Remove comments.' 
        return (''.join ([x [0] for x in LINE_PRESERVE.findall (group)]) if preserve_lines else '') 
def evaluate(m, preserve_lines) : 
        'Search for comments.' 
        g = m.groupdict () 
        return (g ['code'] if (g ['code'] is not None) else remove_comments (g ['comments'], preserve_lines)) 
return ''.join (map ((lambda m : evaluate (m, preserve_lines)), pattern.finditer (pattern))) 

    
    

    Fix the buggy line: return ''.join (map ((lambda m : evaluate (m, preserve_lines)), pattern.finditer (pattern)))
assistant
#Here is Python program to fix the buggy line: return ''.

return ''.join (map ((lambda m : evaluate (m, preserve_lines)), pattern.finditer (text)))