Thank you to all of you who have suggested the form s/(?$flags:$pattern)/$replacement/. I think this will get me much of what I need. The fact that the global-replace flag "g" doesn't work in this position is an annoying wrinkle, but I am going to take a deep breath and code up the with-g and without-g cases separately, depending on whether or not $flags =~ s/g// succeeds.

In reply to Re^2: Regexp substitution using variables by MikeTaylor
in thread Regexp substitution using variables by MikeTaylor

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