[...] ISNI reserved an initial block of identifiers for use by ORCID when we launched the ORCID registry in 2013. The first range of identifiers was defined between 0000-0001-5000-0007 and 0000-0003-5000-0001.
Fast forward to 2023. The ORCID registry has grown, now with over 16 million records, which means we required a new block of identifiers. This new range reserved for ORCID by ISNI is defined between 0009-0000-0000-0000 and 0009-0010-0000-0000.
We need to adapt the regular expressions that enforce these ranges.
Quoting from the ORCID FAQ What is the relationship between ISNI and ORCID? (published 2023-02-22):
We need to adapt the regular expressions that enforce these ranges.