How to add character after a line

I'm trying to perform a few regex steps, and I'd like to add a quotation mark and a comma (",) at the end of these lines without altering any of the rest of the characters in the line.

How would I keep things intact but add the ", after the words: device1, device2, device3 ?

Example of lines I'm working with:

object network device1  
host 192.168.1.11  
object network device2  
host 192.168.1.12  
object network device 3  
host 192.168.1.13  

After my first step of regex, I have modified my first line to include the curly bracket and some formatting with the words "category" and "name" as shown below. However, I don't want to change the word device1, but want to include a quotation and comma after the word device1

{  
"category": "network",  
"name": "device1  
host 192.168.1.11  
{  
"category": "network",  
"name": "device2  
host 192.168.1.11  
{  
"category": "network",  
"name": "device3  
host 192.168.1.13  

I can't figure out how to include the ", with my first step in my regex replace sequence?

I'm using both regexr.com and Notepad++.

You can use this regex to match each entity in your input data:

object\s+(\w+)\s+([^\r\n]+)[\r\n]+host\s+([\d.]+)

This matches:

• object\s+ : the word "object" followed by a number of spaces
• (\w+) : some number of word (alphanumeric plus _) characters, captured in group 1
• \s+ : a number of spaces
• ([^\r\n]+) : some number of non-end-of-line characters, captured in group 2
• [\r\n]+ : some number of end-of-line characters
• host\s+ : the word "host" followed by a number of spaces
• ([\d.]+) : some number of digit and period characters, captured in group 3

This can then be replaced by:

{\n "category": "$1",\n "name": "$2",\n "host": "$3"\n},

To give output (for your sample data) of:

{
 "category": "network",
 "name": "device1",
 "host": "192.168.1.11"
},
{
 "category": "network",
 "name": "device2",
 "host": "192.168.1.12"
},
{
 "category": "network",
 "name": "device 3",
 "host": "192.168.1.13"
},

Regex demo on regex101

Now you can simply add [ at the beginning of the file and replace the last , with a ] to make a valid JSON file.

This is the regex "name": "(device\d+) but since you have not mentioned any programming language you might get some pattern error based on the language you are using for example "" in java will need escape character so if you are using java then use this regex
\"name\": \"(device\d+)
Now you have to extract group (device\d+) and put your " there
for example in java you can do it with string.replaceAll