ElasticSearch Analyzers for Emails

So last week while I was setting the analyzers on ElasticSearch settings for Email field, it took me some good time to find the perfect custom analyzer for my purpose, so I feel it might be useful to share this with someone who needs it.

Let me briefly explain what I am trying to do with my Email field. The email addresses will be stored as a comma separated string with potentially multiple email addresses, and what I am expecting is after the to search to retrieve the matching results. Besides the exact match like search for "john.doe@gmail.com", I also want to be able to search for "john.doe" or "gmail.com" to retrieve the relative information.

Here is the full schema for it:

And the search schema is:
[Search > Response]
“john.doe@gmail.com” > 1,2
“john.doe@outlook.com” > 2,4
“john@yahoo.com” > 5
“john.doe” > 1,2,3,4
“john” > 1,2,3,4,5
“gmail.com” > 1,2
“outlook.com” > 2,3,4

If you decide to keep reading, then it means you have the same needs as I did so I hope the following solution can actually help.
So… In the official documentation they did have a good solution but it was not easy to find, at least for me, by using regular expression:

This setting will perfectly address the issues from above, and do not generate way to much tokens in your ES cluster.
At the end I want to share two good gadgets that I found very helpful with ES analyzers and regular expression.

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