import re


def get_example_line(s):
    """
    Get the example line.
    :param s: A line of text.
    :return: The example line if it exists.
    """
    reg = re.compile(r'^\[[^\(]*\]\(([^)]*)')
    if reg.match(s):
        return [''.join(reg.findall(s))]
    return ['']