YAML should store the pattern (( re::regexp_pattern($re) )[0] ) and the modifiers ( ( re::regexp_pattern($re) )[1] ) separately.

...and YAML::XS should make use of XS(XS_re_regexp_pattern) in universal.c to achieve that. Inevitably, this raises backcompat issues.

perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'

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

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