Finding a DOI in a document or page

Question

The DOI system places basically no useful limitations on what constitutes a reasonable identifier. However, being able to pull DOIs out of PDFs, web pages, etc. is quite useful

Answer 1

Here is my go at it:

(10[.][0-9]{4,}[^\s"/<>]*/[^\s"<>]+)

And a couple of valid edge cases where this doesn't fail, but others seem to do:

• 10.1007/978-3-642-28108-2_19
• 10.1007.10/978-3-642-28108-2_19 (fictitious example, see @Ju9OR comment)
• 10.1016/S0735-1097(98)00347-7
• 10.1579/0044-7447(2006)35\[89:RDUICP\]2.0.CO;2

Also, correctly discards some falsy (X|HT)ML stuff like: