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Can't ENCLOSE_OPTION be allowed in look-behind? #17
Currently Onigmo (or Oniguruma) does not allow option enclosures (like
Taking Ruby as example, this restriction prevents a pattern from being interpolated within a look-behind construct of another.
This pull request is an unconfirmed attempt to fix the problem.
It doesn't seem like it. In Onigmo/Oniguruma, look-behind does not take Unicode case-folding into account in the first place.
Below is taken from an irb session on ruby 2.0.
This looks like a bug.