Mirrors in interpolated shell code in snippets

For when a single regular expression is not sufficient for a mirror
transformation, is there any way to access current mirror values from
within interpolated shell code in snippets?

(I'm trying to write a transformation that will first convert a human
phrase to CamelCase /then/ lowercase the first character to generate a
StudlyCaps version of the phrase.)

--
Benjamin Hawkes-Lewis

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