How to fix this json email pattern

I'm creating Collection USER where he is asked to add an email field.

This is what I have in the validation collection.

db.createCollection("user", {
validator: {
    $jsonSchema : {
        bsonType: "object", 
        required: ["email"],
    properties: {
        "email": {type: "string", pattern: "^(\\([a-z] {30}\\))?[a-z]{30}@[.]$"}
}}}})

I expect MongoDB to accept email in "email@email.com" format. The validation does not allow such a pattern.

WriteResult({
"nInserted" : 0,
"writeError" : {
    "code" : 121,
    "errmsg" : "Document failed validation"
}})