A variant of this idea would be to memoize qr: 

{
  my %cache;
  sub my_qr { $cache{ $_[0] } ||= qr/$_[0]/ }
}

[download]
though one loses some of the modifier syntax.

the lowliest monk

In reply to Re^2: Converting a stringified regexp back into a regexp by tlm
in thread Converting a stringified regexp back into a regexp by mirod

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