Incorrect help message

[YowSiaoKang]

Emails should be of the format local-part@domain and adhere to the following constraints:
1. The local-part should only contain alphanumeric characters and these special characters, excluding the parentheses, (+_.-). The local-part may not start or end with any special characters.
2. This is followed by a '@' and then a domain name. The domain name is made up of domain labels separated by periods.
The domain name must:
    - end with a domain label at least 2 characters long
    - have each domain label start and end with alphanumeric characters
    - have each domain label consist of alphanumeric characters, separated only by hyphens, if any.

For the following emails supplied, the above help message will be shown which seems to be an invalid help message.

• a++a@aaa: message specifies that '+' is supported in local-part but consecutive special characters results in error.
• aaa@aaa.a-a: message specifies that '-' is supported in domain label but it is not for the last domain label

I would like to clarify if fixing of the help message in our app is allowed. Thank you!

[damithc]

@YowSiaoKang What's the proposed change to the error message?

[YowSiaoKang]

Emails should be of the format local-part@domain and adhere to the following constraints:

1. The local-part should only contain alphanumeric characters and these special characters, excluding the parentheses, (+_.-). Special characters must not be consecutive and the local-part may not start or end with any special characters.
2. This is followed by a '@' and then a domain name. The domain name is made up of domain labels separated by periods. The domain name must:
   • end with a domain label at least 2 characters long
   • have each domain label start and end with alphanumeric characters
   • have each domain label consist of alphanumeric characters, separated only by a single hyphen, if any. Ending domain label should not contain any hyphens.

[damithc]

@YowSiaoKang Yes, you can update the error message.

[YowSiaoKang]

Thank you prof!!! @damithc