Então você quer substituir, entre parênteses, por um ponto-e-vírgula?
Tente isto:
Find: \((.*)(,)(.*)\)
Explanation: \( - Literally capture a left bracket
(.*) - Captures everything and groups it until...
(,) - Captures the comma and groups it
(.*) - Captures everything and groups it until...
\) - ... the literal right bracket.
Replace With: \($1;$3\)
Explanation: We replace everything caught above, meaning we need to put in...
\( - The literal left bracket again
$1 - The first group we captured before (everything before ,)
; - Our replacement for the comma, a semi colon
$3 - The third group we captured before (we skipped 2, the comma, and got everything after)
\) - Finally, our literal right bracket again
Eu poderia ter tornado isso um pouco mais preciso e, em vez disso:
Find: \((.*)(?:,)(.*)\)
Explanation: (?:) means the group doesn't capture, so we now replace with:
Replace With: \($1;$2\)
No modo REGEX, é claro.
Espero que isso ajude.