Scholarly and Academic Identifier Utilities R package scholid version 0.2.0 Detects, normalizes, classifies, and extracts scholarly identifier strings. Provides lightweight, dependency-free helpers for twenty identifier types, including DOIs, ORCID iDs, ISBNs, ISSNs, arXiv and PubMed identifiers, ROR and ISNI, OpenAlex and ADS bibcodes, RRID, ARK, SWHID, and selected life-science accessions (UniProt, RefSeq, SRA, GEO, BioProject, and genome assemblies). Functions are vectorized, predictable, and suitable as low-level building blocks for other R packages and data workflows. Use 'scholid_types()' for the authoritative type list. For online lookup, conversion, metadata retrieval, and linked identifier discovery, see 'scholidonline'. Software Depends: R (>= 3.5.0) Suggests: testthat (>= 3.0.0), knitr (>= 1.30), rmarkdown Thomas Rauter <rauterthomas0@gmail.com> Comprehensive R Archive Network (CRAN) Thomas Rauter [aut, cre, fnd] (ORCID: <https://orcid.org/0009-0004-5578-3628>) MIT + file LICENSE (https://CRAN.R-project.org/package=scholid/LICENSE) 2026-06-04 application/tgz https://CRAN.R-project.org/package=scholid doi:10.32614/CRAN.package.scholid en-US