Check if an argument is an ISSN string — is_issn • checkstring

Validates ISSN format including check digit verification.

Usage

is_issn(x)

Arguments

x: (any)
Object to check.

Value

TRUE if x is a valid ISSN string, FALSE otherwise.

References

https://www.loc.gov/issn/check.html

Examples

is_issn("0378-5955")
#> [1] TRUE