tex= c("This is a citation \\upcite{key1,key2} and \\citep{key3-a }",
"This is a citation \\citet{key1,key2} and \\citet{key3-a }",
"this is no citation",
"",
"This is a citation \\upcite{key1,key4} and \\cite{key3-a }")
cites_extract(tex)
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