Most vehicle license/number plate extractors I've found involve reading a plate from an image (OCR) but I'm interested in something that could tag instances of license plates in a body of text. Are there any such annotators out there?
There are a lot of pretty decent tools out there for text annotation in general, and given the broad nature of the task you're approaching (license plates are about as general as words), the annotation tools you are looking at should probably come from the more classical tools for annotation.
There was actually a pretty good discussion about annotation tools on this question, which should actually apply to this problem. The most relied-upon thing in annotation right now is probably
brat. You can learn more about
Hope that helps! Let me know if you've got any more questions.