我有像下面这样的文件，我想更新“whitelistSelectorRegex”下volumeSelectorConfig节。

volumeMonitorConfig:
    # maxNumberVolumes specifies the maximum number of volumes that the
    # machine agent will monitor.
    maxNumberVolumes           : 5

    # whitelistSelectorRegex specifies the regular expression used to whitelist reported volumes
    # by name. A volume with the name matching the regex will always be reported,
    # with respect to maxNumberVolumes
    whitelistSelectorRegex        : ""

    # blacklistSelectorRegex specifies the regular expression used to blacklist reported volumes
    # by name. A volume with the name matching the regex will never be reported, unless it also
    # matches the whitelistSelectorRegex. By default volumes created by docker storage drivers are blacklisted.
    # For example, /var/lib/docker/devicemapper/a24b981234c1
    blacklistSelectorRegex        : "^/var/lib/docker/.*"

    # samplingInterval indicates how often to gather metric data. Units in milliseconds.
    # This overrides the standard sampling interval. If this is not set the standard sampling
    # interval is used. This is currently supported only on Linux.
    samplingInterval: 3000

networkMonitorConfig:
    # maxNumberNetworks specifies the maximum number of network interface cards that the
    # machine agent will monitor.
    maxNumberNetworks            : 5

    # whitelistSelectorRegex specifies the regular expression used to whitelist reported networks
    # by name. A network with the name matching the regex will always be reported,
    # with respect to maxNumberNetworks.
    whitelistSelectorRegex       : ""

    # blacklistSelectorRegex specifies the regular expression used to blacklist reported networks
    # by name. A network with the name matching the regex will never be reported, unless it also
    # matches the whitelistSelectorRegex. By default, virtual network interfaces are on the blacklist.
    blacklistSelectorRegex       : "^veth.*|^vnet.*"

我尝试了sed，似乎这不是一个好的选择，我发现