DOIs and matching regular expressions | CrossTechWe regularly see developers using regular expressions to validate or scrape for DOIs. For modern CrossRef DOIs the regular expression is short /^10.\d{4,9}/[-._;()/:A-Z0-9]+$/i For the 74.9M DOIs we have seen this matches 74.4M of them. If you need to use only one pattern then use this one. The other 500K are mostly from CrossRef’s early days when the battle between “human-readable” identifiers an
