[release/2.8 backport] reference: fix broken alias for DomainRegexp #4114
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An incorrect alias snuck into 152af63 (#4031), and DomainRegexp was aliased to the regex for digests (DigestRegexp).
This didn't affect this repository, as it didn't use the aliases and migrated to the new module, but does affect user of the old module that depend on the aliases.
(cherry picked from commit c8c2bc2)