case
demo string is
/sbin/dhclient /xx -4 -d -nw -cf /run/dhclient/dhclient_eth1.conf -pf /run/dhclient/dhclient_eth1.pid
target
/run/dhclient/ is prefix path, it would change as os version changes, so get the /run/dhclient/
code
echo "/sbin/dhclient /xx -4 -d -nw -cf /run/dhclient/dhclient_eth1.conf -pf /run/dhclient/dhclient_eth1.pid" | grep -P "/\S*?eth1.conf " --color
resp
/run/dhclient/dhclient_eth1.conf
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