No, definitely not the same code, but the same properly formatted flat text: the General and Juicy Details of the reviews. Once formatted, Code-1 is for searching reviews for specific strings and displaying the results to the searcher; Code-2 is for plagiarism checking and alerting the searcher (TER admin or even just automate it to search every submission and just flag the bad ones).
I think the web-based plagiarism checkers look for copied term papers, short stories and stuff like that so they search the entire internet. TER doesn't need that. I think they could run their own code and only compare new reviews to the existing database of reviews. 250 petabytes versus a few tens of gigabytes.
I guess they'd have to set a threshold for pattern matching, beyond just common abbreviations. And maybe something TOO common ("Treat her well.") can be relegated to the innocuous copying category. Less common multiples might be the trigger. Yeah, there might be the need for some tweaking.
Maybe a TER-only on-line tool for members-only to do the checking if they read something that sounds a little too familiar.
Anyway, two problems (searching reviews; cutting down on one category of fake reviews) might be solved using overlapping resources and the flat text Review text.
Posted By: NoYellowEnvelope
... for free text search and plagiarism checking. But there are plagiarism checkers with an open API such that it would be easy for TER to use one of those, either as a service or running the code themselves. As for the free text search, there's many tools for doing that also, from simple SQL pattern matching to more sophisticated methods.
But I wonder if a plagiarism checker would work with reviews. There's so many common acronyms and phrases used in reviews, with no intent to plagiarize, that a checker might get a lot of false positives, leading to either innocent reviewers' work being rejected, or more Admin time reviewing all "hits" to ensure they're really cases of plagiarism.
Besides, haven't you heard that imitation is the sincerest form of flattery?

Yes, thank you for the flattery. I've said that so many times myself.
-- Modified on 12/20/2016 6:03:25 PM