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How can I relpace in a list like this a Symbol by {}:

{x$1273, 14, x$1275}, {25, 33}, {x$1274}}

I would like to get:

{{}, 14, {}}, {25, 33}, {{}}}
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Use Replace with level spec {-1}:

Replace[{{x$1273, 14, x$1275}, {25, 33}, {x$1274}}, _Symbol -> {}, {-1}]

{{{}, 14, {}}, {25, 33}, {{}}}

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If you don't want to worry about levels, you can use

{{x$1273, 14, x$1275}, {25, 33}, {x$1274}}/. Except[List, _Symbol] -> {}

{{{}, 14, {}}, {25, 33}, {{}}}

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