While strongly endorsing the string templating approach, there is also a discussion of this double-quotish nested string interpolation stuff in Evaluating $1 construct in literal replacement expression and along the links from the reply Re: Evaluating $1 construct in literal replacement expression.

In reply to Re: Interpolating backreferences in an eval by AnomalousMonk
in thread Interpolating backreferences in an eval by gnustavo

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