匹配pci实例路径 正则表达式
    English answer:
    PCI Instance Path Regex.
    A PCI instance path is a string that uniquely identifies a PCI device on a system. It is used by the operating system to identify and access the device. The format of a PCI instance path is as follows:
    pci@[<bus>:<device>:<function>]
    where:
    pci is the type of device.
    @ is the separator between the device type and the device instance.
    <bus> is the PCI bus number.
    <device> is the PCI device number.
    <function> is the PCI function number.
    For example, the following is a PCI instance path for a device on bus 0, device 1, and function 0:
    pci@0:1:0。
    Regular Expression.
    The following regular expression can be used to match a PCI instance path:
    ^pci@([0-9]+):([0-9]+):([0-9]+)$。
    where:
    ^ matches the beginning of the string.
    pci matches the device type.
    @ matches the separator between the device type and the device instance.
    ([0-9]+) matches the PCI bus number.
    : matches the colon separator between the bus number and the device number.
正则匹配中文字    ([0-9]+) matches the PCI device number.
    : matches the colon separator between the device number and the function number.
    ([0-9]+) matches the PCI function number.
    $ matches the end of the string.
    Example.
    The following Python code can be used to match a PCI instance path:
    python.
    import re.
    pattern = r'^pci@([0-9]+):([0-9]+):([0-9]+)$'。
    path = 'pci@0:1:0'。
    match = re.match(pattern, path)。
    if match:
        bus = up(1)。
        device = up(2)。
        function = up(3)。
        print('Bus:', bus)。
        print('Device:', device)。

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