Anonymous,

Interpolation cannot perform a substitution, nor would an intended interpolation of the variable for a capture group such as $1 interpolate correctly outside of the substitution.

I don't mind being called a rookie. I consider myself to basically be one, despite having been learning Perl for nearly 15 years. I didn't study computer programming in college, and feel much less gifted than most here, which is why I so much appreciate the advice of those here whom I look up to for their skill. But posting inaccurate information regarding the possibility of using interpolation, and providing no example for how such would solve this issue, is not helpful.

Because my variables have come in from an HTML form, they are "tainted," whether I like this or not. Interpolation will neither untaint them, nor perform the required substitution. If I have misunderstood, or am somehow in the wrong, I will welcome your courteous correction.