It's about preserving the flags of the embedded regex ...

Yes, and the reason that is done is, at least in part, to make composition of relatively more complex regexes from simpler  qr// components (via interpolation) work "right."

Give a man a fish:  <%-{-{-{-<

In reply to Re^3: Tidying and simplifying a regular expression by AnomalousMonk
in thread Tidying and simplifying a regular expression by Dallaylaen

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