Actually, almost all of the above fail because they need a 'g' on the end. The one above by ovid fails on a case of "(foo;bar;baz)"

And, my version, which only worries about running the second replace on those parens that have a semi-colon in them:

s#(A[^AZ]*;+[^AZ]*Z)#{($_=$1)=~s/;/,/g;$_}#eg;
[download]

Disclaimer: I replaced ( and ) with A and Z for increased readability. It's ugly enough already! :)

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