How to Delete lines that contain more than three dots in a email before @ character using SED?

Question

sed '/\(.*\..*\)\{4,\}/d'

The above command mentioned recognizes every DOT in the line...

It is recognizing DOTS after @ sign too. For example, even this is shown in the result: [email protected]

Can you help me modify the above command in such a way that only the LEFT side of @ it counts the Multiple DOTS more than 3 and ignores the DOTS after the character @ to right side of the email?

Eg:

[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]
[email protected]

I want the following lines with multiple Dots (3 or more dots) at the LEFT SIDE of @ Character to be only recognizers and deleted from the file.

[email protected]
[email protected]
[email protected]

Any experts, plz suggest me how to modify the above SED command.... Thanks

Answer 1

I'm not an expert but, to delete only the 4 dots (or more) patterns at the left side of @ you can simply add @.* at the end of your expression:

sed '/\(.*\..*\)\{4,\}@.*/d'

It means to delete the 4 dots (or more) patterns at the left side of the @ regardless what characters are at the right side.