The 'Email address' preset in the Regular Expression operation was
missing the 4th IPv4 octet in the bracketed address form, causing
addresses like user@[1.2.3.4] to never match.
The IPv4 bracket group ended after {3} repetitions of 'octet.':
\\[(?:(?:(octet))\.){3}\\]
This matches [1.2.3.] (a false positive) but not [1.2.3.4].
Fix: add the 4th octet group before the closing bracket, mirroring
the correct regex already used in ExtractEmailAddresses.mjs:
\\[(?:(?:(octet))\.){3}(?:(octet))\\]
Closes#2150
a3f4e15b29