Sed to add quotes around json text following a specific json key - sed

Question

I have below malformed json file. I want to quote the value of email, i.e "sampleemail#sampledoman.co.org". How do I go about it? I tried below but doesn't work.
sed -e 's/"email":\[\(.*\)\]/"email":["\1"]/g' sample.json
where sample.json looks like below
{
"supplementaryData": [
{
"xmlResponse": {
"id": "100001",
"externalid": "200001",
"info": {
"from": "C1022929291",
"phone": "000963586",
"emailadresses": {
"email": [sampleemail#sampledoman.co.org
]
}
},
"status": "OK",
"channel": "mobile"
}
}
]
}

Answer 1

Your code does not work because
[ is not escaped so not treated as a literal
You are using BRE, so capturing brackets will need to be escaped. In its current format, you will need -E to use extended functionality
The line does not end with ]
You did not add the space so there is no match, hence, no replacement.
For your code to work, you can use;
$ sed -E 's/"email": \[(.*)/"email": ["\1"/' sample.json
or
$ sed -E '/\<email\>/s/[a-z#.]+$/"&"/' sample.json
{
"supplementaryData": [
{
"xmlResponse": {
"id": "100001",
"externalid": "200001",
"info": {
"from": "C1022929291",
"phone": "000963586",
"emailadresses": {
"email": ["sampleemail#sampledoman.co.org"
]
}
},
"status": "OK",
"channel": "mobile"
}
}
]
}

Answer 2

With your shown samples, please try following awk code. Written and tested in GNU awk. Making RS as NULL and using awk's function named match where I am using regex (.*)(\n[[:space:]]+"emailadresses": {\n[[:space:]]+"email": \[)([^\n]+)(.*) to get required output which is creating 4 capturing groups which are 4 different values into array named arr(GNU awk's functionality in match function to save captured values into arrays) and then printing values as per requirement(adding " before and after email address value, which is 3rd element of arr OR 3rd capturing group of regex).
awk -v RS= '
match($0,/(.*)(\n[[:space:]]+"emailadresses": {\n[[:space:]]+"email": \[)([^\n]+)(.*)/,arr){
print arr[1] arr[2] "\"" arr[3] "\"" arr[4]
}
' Input_file