I agree with Joost, you should probably use function references as he suggests.
However, there's a couple ways to do what you want if you are stuck with a value that is a function name.
Cheap way 1:
eval "&$s()";
Or you could try:
&{ &UNIVERSAL::can('main', $s) }();
To rewrite the second example to make it nicer:
my $funcRef = &UNIVERSAL::can('main', $s);
if( ref($funcRef) eq 'CODE' ) { &$funcRef(); }
else { warn "Function $s not found in package main!"; }
(update: should probably check the return from 'can' to ensure it returns a function reference)
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