I have some data that looks like this: 
arn:aws:iam::11111111111:role/ADFS-MyRoleName
"Alexa for Business"
"AWS Certificate Manager"
"AWS Certificate Manager Private Certificate Authority"
"AWS Amplify"
"Manage - Amazon API Gateway"
"AWS App Mesh"
"Amazon AppStream 2.0"
"AWS AppSync"
"Amazon Athena"
"AWS Auto Scaling"

arn:aws:iam::12345678901:role/Role2-Role2
"Alexa for Business"
"AWS Certificate Manager"
"AWS Certificate Manager Private Certificate Authority"
"AWS Amplify"
"Manage - Amazon API Gateway"
"Application Auto Scaling"
"AWS App Mesh"
"Amazon AppStream 2.0"
"AWS AppSync"

[download]

I would like to create a hashmap so I can count the # of items under each of the 'arn' so the key would be arn:aws:iam::11111111111:role/ADFS-MyRoleName and the values would be everything until the 'blank line' which is the end of record marker. I had thought of using split, but am unsure on how to get the 1:many relationship going. I suspect I need to somehow use a for loop and iterate through each 'arn' value, see what happens between them, and then create a map from that. The only problem is I have no idea how to do this. I looked at data:dumper but this always assumes 1:1 relationships afaik. I couldn't grok it. Could anyone suggest a code snippet that will at least create the datastructure? I can do the rest, but I really am not good at datastructures.

"Two Wheels good, Four wheels bad."

In reply to How to Map a scalar to a key that is an array? by symgryph

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