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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 read_examples(input_file):
 """Read a list of `InputExample`s from an input file."""

    examples = []
    unique_id = 0
    with open(input_file, "r", encoding='utf-8') as reader:
        while True:
            line = reader.readline()
            if not line:
                break
            line = line.strip()
            text_a = None
            text_b = None
            m = re.match(r"^(.*) \|\|\| (.*)$", line)
            if m is None:
                text_a = line
            else:
                text_a = m.group(1)
                text_b = m.group(2)
            examples.append(
                InputExample(unique_id=unique_id, text_a=text_a, text_b=text_b))
            unique_id += 1
    return examples