bbfu's answer is what you want, but you might also be interested in the /e modifier to the substitution op.

s/(\${\w+})/find_value_for_var("$1")/e

The above code will find alphaneumerical sequences enclosed in ${}, and then send them to the find_value_for_var() function. Perhaps a more coherent example is

s/(\d+)/$1 + 5/e;

Which will find a sequence of digits, then construct the perl expression for those digits, then an addition operator, and then a five, and then evaluate this code, returning the number that was matched plus five.

-nuffin
zz zZ Z Z #!perl

In reply to Re: replacing "dynamic" variables by nothingmuch
in thread replacing "dynamic" variables by emilford

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