It would be possible to store a regex as a sequence and use the same tag for it: 
---
re1: !!perl/regexp (?^usi:pattern)
re2: !!perl/regexp [ pattern, isu ]

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For perl 5.8 the old behaviour could be used. This could be done for YAML and YAML::XS. Possibly also for YAML::Syck, which has the same problem, but I would have to ask Todd, the maintainer.

In reply to Re^2: YAML::XS perl/regexp (?u:(?u: by tinita
in thread YAML::XS perl/regexp (?u:(?u: by Boldra

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