Eval substitutions

/e flag says "replacement is code to generate a string".
s/(\d+)C/($1*9/5)+32 . "F"/ge;
No run-time compilation.
Can stack e's: "replacement is code that builds code to generate a string":
s/(\$\w+)/$1/gee; # expand variables

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YAPC 2000: Stages of a Perl Programmer - 31