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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 find_char_color(ansi_string, pos):
 """Determine what color a character is in the string. :param str ansi_string: String with color codes (ANSI escape sequences). :param int pos: Position of the character in the ansi_string. :return: Character along with all surrounding color codes. :rtype: str """

    result = list()
    position = 0  # Set to None when character is found.
    for item in (i for i in RE_SPLIT.split(ansi_string) if i):
        if RE_SPLIT.match(item):
            result.append(item)
            if position is not None:
                position += len(item)
        elif position is not None:
            for char in item:
                if position == pos:
                    result.append(char)
                    position = None
                    break
                position += 1
    return ''.join(result)