RFC 7542, "The Network Access Identifier", May 2015

Errata ID: 8105
Status: Verified
Type: Technical
Publication Format(s) : TEXT
Reported By: Matthew Ogilvie
Date Reported: 2024-09-16
Verifier Name: Deb Cooley
Date Verified: 2025-01-24

Section 3.4 says:

Examples of valid Network Access Identifiers include the following:
[...]
        \(user\)@example.net

It should say:

Examples of invalid Network Access Identifiers include the following:
[...]
        \(user\)@example.net

Notes:

\(user\)@example.net is listed as a valid example, but neither backslashes nor parentheses are allowed in the ABNF rules (sections 2.1 and 2.2). Obsoleted RFC 4282 had ABNF rules to allow for backslash escapes, but RFC 7542 does not. These are the only backslashes in the entire document.

Perhaps this example should be moved to the invalid examples list?

Or perhaps the ABNF rules should be extended to allow some forms of backslash escapes, although probably not to the same wide-open extent as RFC 4282?

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