Showing all the entertaining custom regexes defined in https://git.wikimedia.org/blob/wikimedia%2Fbugzilla%2Fmodifications.git/HEAD/extensions%2FWikimedia%2FExtension.pm for https://phabricator.wikimedia.org/T850 here.
replacerWP: [[meta:en:foobar]]
replacerWP: [[Foobar]]
replacerWP: [[en:wp:foo:bar:meow]]
replacerWP: [Foobar] hopefully does not link.
replacerCR: r12345
replacerRT: RT 1234
replacerRT: RT #1234
replacerGerritChangeset: Gerrit 12
replacerGerritChangeset: Gerrit #12
replacerGerritChangeset: Gerrit 9 (not linked as only one digit)
replacerGerritChangeset: Gerrit #9 (not linked as only one digit)
replacerGerritChangeId: I1a2b3c
replacerGerritChangeId: I1a2b3c4
replacerGerritChangeId: I1a2b3c4e5f123456789012345678901234567890
replacerGerritChangeId: I1a2b3c4e5f1234567890123456789012345678901
replacerGerritChangeId: I1a2b3c4e5f12345678901234567890123456789012
replacerGitCommit: I1a2b3c
replacerGitCommit: I1a2b3c4
replacerGitCommit: I1a2b3c4e5f123456789012345678901234567890
replacerGitCommit: I1a2b3c4e5f1234567890123456789012345678901
replacerGitCommit: I1a2b3c4e5f12345678901234567890123456789012
A Gerrit link with a linebreak in BZ is https://gerrit.wikimedia.org/r/#q,I0d6c654a7354ba77e65e338423952a6a78c1150f,n,z
Something even longer is https://gerrit.wikimedia.org/r/gitweb?p=operations/mediawiki-config.git;a=blob;f=wmf-config/CommonSettings.php;h=954509678eeb4c1079fb7addfa189001671c6671;hb=HEAD#l1530
replacerCVE: CVE-2013-7106
Version: unspecified
Severity: normal