regexp and sed find block of string in multiline block untill it end with space

Question

I try to capture those blocks of strings and comment on them using regexp and sed. Each block separated with space:

some text here 
some text here 

AppServer1:
  name: ${AppServer1.name}
  ip: ${AppServer1.ip}
   
some text here 
some text here 

AppServer2:
  name: ${AppServer1.name}
  ip: ${AppServer1.ip}

some text here 
some text here 
   

I try with this regexp:

sed E '/./{H;1h;$!d} ; x ; s/[^\$AppServer1](AppServer1)/#\1/gi'

but the result is:

 #AppServer1:
      name: $#{AppServer1.name}
      ip: $#{AppServer1.ip}

What am I missing here to comment the full string to be as below?

#AppServer1:
#      name: ${AppServer1.name}
#      ip: ${AppServer1.ip}

Answer 1

Using gnu-sed, you can do this:

sed '/^AppServer1/I{:a; /^[[:blank:]]*$/!{s/.*/#&/; n; ba;} }' file

some text here
some text here

#AppServer1:
#  name: ${AppServer1.name}
#  ip: ${AppServer1.ip}

some text here
some text here

AppServer2:
  name: ${AppServer1.name}
  ip: ${AppServer1.ip}

some text here
some text here

Details:

• /^AppServer1/I: Search for AppServer1 case insensitive
• {: Block start
  • :a: Make label a
  • /^[[:blank:]]*$/! If a line is not a blank line
  • {s/.*/#&/; n; ba;}: Prepend each line with #, read next line and goto label a
• }: Block end

---

Using awk you can do this:

awk '/^AppServer1/ {b=1} b && !NF {b=0} b {$0 = "#" $0} 1' file

some text here
some text here

#AppServer1:
#  name: ${AppServer1.name}
#  ip: ${AppServer1.ip}

some text here
some text here

AppServer2:
  name: ${AppServer1.name}
  ip: ${AppServer1.ip}

some text here
some text here