Maybe it was renamed? See this note in the Changes file of Regexp::DefaultFlags:

----------------------------------------------------------------------
r8252:  autrijus | 2004-09-27T18:33:54.779668Z

* This be 0.01 of Regexp::DefaultFlags.
* Renamed from Regexp::Auto; suggested by Jesse Vincent.
* Added tests; now at 100% coverage.

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In reply to Re: Where is Regexp::Autoflags ???? by ptum
in thread Where is Regexp::Autoflags ???? by ghenry

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