sed 替换字符串和ip ([a-z]+) [0-9.]+

[root@k8s-master01 ~]# cat aa1.txt
aaaabbbccc
jfdjk
asdfghj
zxcvbqwertyuiop
helloword
[root@k8s-master01 ~]# sed  -nr 's#he(.*)rd#\1#gp' aa1.txt
llowo
[root@k8s-master01 ~]# sed  -i.bak -r  's#he([a-z]+)rd#hekkkrd#g' aa1.txt
[root@k8s-master01 ~]# cat aa1.txt
aaaabbbccc
jfdjk
asdfghj
zxcvbqwertyuiop
hekkkrd
[root@k8s-master01 ~]# sed  -i.bak   's#he([a-z]+)rd#he===rd#g' aa1.txt
[root@k8s-master01 ~]# cat aa1.txt
aaaabbbccc
jfdjk
asdfghj
zxcvbqwertyuiop
hekkkrd
[root@k8s-master01 ~]# sed  -i.bak -r   's#he([a-z]+)rd#he===rd#g' aa1.txt