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How does the automatic subjective filter work?

When you're writing a question, the system will show you a red bar with a warning if the question looks subjective.

Subjective or non-programming questions (e.g., What is your favourite programming language?) seem to be easily recognized.

How, exactly, is this done? Heuristics, algorithms, machine learning?

I'm amazed!

marked as duplicate by xmm0, Kip, Shog9, Troggy, dbr Oct 28 '09 at 17:14

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migrated from stackoverflow.com Oct 28 '09 at 16:32

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Jeff uses this regex:

return Regex.IsMatch(s, 

I'm fairly sure it just detects words like "favo[u]rite" and "best". I've not seen it detect a non-programming question.


Having the word "best" in the title triggers it.