When building lookup engine, how to remove the separators in ISBNs?

That is, from "978-0-521-48022-2" to "9780521480222". Certain websites do not work with the former.

The following JSON got the separated version. How could I get something like "9780521480222"?

Thank you!

"_urlTemplate": "https://search.douban.com/book/subject_search?search_text={rft:aufirst?}+{rft:aulast?}+{rft:title?}+{z:ISBN?}",
"_urlParams": [],
"_method": "GET",
"_urlNamespaces": {
"rft": "info:ofi/fmt:kev:mtx:book",
"xmlns": "http://a9.com/-/spec/opensearch/1.1/",
"z": "http://www.zotero.org/namespaces/openSearch#"
},

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