The "actual" issue is YAML::XS will not properly roundtrip regular expression serialization and deserialization. There is no solution—other than using a better-behaved YAML handler—until the package is patched against this bug.

In reply to Re^3: YAML::XS perl/regexp (?u:(?u: by Your Mother
in thread YAML::XS perl/regexp (?u:(?u: by Boldra

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