local our $limit = 10;
/($re)(?(?{ length($^N) > $limit })(?!))/
It will even backtrack until the limit isn't exceeded unless you do something like
/((?>$re))(?(?{ length($^N) > $limit })(?!))/
The features aren't nearly as experimental as implied. After all, they survived three major version (5.6, 5.8 and 5.10)! $^N requires 5.8, but you can use $1 if you want compatibility with 5.6.
Update: Oops, forgot that this needed to be for split. Well, the comment on the experimental features still applies.
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