str_extract_all_doi(string = c(
# nothing to do here
"10.17487/rfc1149",
# space separated
"10.1016/j.iheduc.2003.11.004 doi:10.7875/leading.author.2.e008",
# separated by forbidden
"doi:10.6084/m9.figshare.97218&doi:10.1126/science.169.3946.635 ",
# separated by linebreak
"10.5194/wes-2019-70\n10.5194/wes-5-819-202",
# no DOI here
"quux"
))
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