Extract scholarly identifiers from text — extract

Extract identifiers of a single supported type from free text.

The result is a list with one element per input element. Each element is a character vector of matches (possibly length 0). NA inputs yield an empty character vector.

Matches are returned as extracted identifier tokens from the text. Surrounding prose punctuation or markup fragments may be removed where necessary to isolate the identifier. Invisible characters, such as a soft hyphen or a byte order mark, are removed from the text before matching. Use normalize_scholid() to convert identifiers to canonical form.

Usage

extract_scholid(text, type)

Arguments

text: A character vector of text.
type: A single string giving the identifier type. See scholid_types() for supported values.

Value

A list of character vectors of extracted identifiers.

Examples

extract_scholid("See https://doi.org/10.1000/182.", "doi")
#> [[1]]
#> [1] "10.1000/182"
#> 
extract_scholid("ORCID 0000-0002-1825-0097", "orcid")
#> [[1]]
#> [1] "0000-0002-1825-0097"
#>