This issue references the Plant Environment Ontology, which is registered in Identifiers.org at https://registry.identifiers.org/registry/eo
Actual: ^(P)?EO\:\d{7}$
Expected: ^EO:\d{7}$
Issues:
- the optional 
P does not work 
- there's a redundant escape for the colon
 
- EO isn't the same as the prefix, so how does namespaceEmbeddedinLUI help a user generate a valid CURIE?