We used to have a similar thread match after posting... doing it before posting is not that tricky.
I removed the similar thread match however, as generally people weren't using it and it also gave big issues with posting titles with lots of small words in it (heavy drain on server scanning post titles with words like "the" in it. Limiting it to 4-character words or more makes it less usable anyway.
I'll reserve judgement, but don't think I will be implementing this due to my comment above.
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