Sorry if I dont understand it right, but you have an id of
"Item_SOMENUMBER" as id and just want the SOMENUMBER as post id,
right? I have something similiar in one of my applications, the
following is tested and works (at least if your prefix does not

function getId(realId, prefix) { return realId.replace(prefix, ''); }

Hope I understood right and could help you.

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