Find which strings are valid GWAS Catalog association IDs (returns
TRUE). Association IDs are tested against the following regular
expression: ^\\d+$.
is_association_id(str, convert_NA_to_FALSE = TRUE)A logical vector.
A character vector of strings.
Whether to treat NA as NA
(convert_NA_to_FALSE = FALSE) or whether to return FALSE when
an NA is found (convert_NA_to_FALSE = TRUE).