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Is there a way to search questions that are tagged with either tag1 or tag2?

Actually, I would like the general filter,

([tag1] AND [tag2], ...) OR ([tag3] AND [tag4], ...) OR ...

And even

[tag1] AND ([tag2] OR [tag3])

I need that because I'm looking for interesting questions and I have to search for each tag separately.

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Please have a look at the related questions over there --->. There are currently quite a few issues doing complex searches. – Jon Seigel Jun 17 '10 at 12:53

Search for [tag1] [or] [tag2]. It's the weirdest thing in the world SE tag searching.

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Great, this is what I was looking for! – ks1322 Sep 15 '11 at 16:04
uh, why are you doing [or] when just plain "or" works fine? – Jeff Atwood Jan 3 '12 at 20:14
@JeffAtwood You don't get the page you linked from searching for [uncrustify] or [undef], which Nick says is intentional. Searching using [uncrustify] [or] [undef] does get you to that page, but apparently not intentionally. – Tim Stone Jan 3 '12 at 20:27
@JeffAtwood - Tim is correct. Searching for [tag1] or [tag2] results in a listing of all posts tagged with both [tag1] and [tag2] containing the word or, leading to [this /search page]( q=%5Buncrustify%5D+or+%5Bundef%5D). Searching for [tag1] [or] [tag2] leads to the /tagged page you linked I've edited the answer back to the solution that Waiwai, Nick, Tim Stone, and I have found. – Kevin Vermeer Jan 3 '12 at 21:30
This answer seems to be outdated: works fine now. – Ilmari Karonen Feb 26 '14 at 8:43

I've found my answer here:

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Most of us search by using the 'search' box, not by appending our query to the /tagged URL. – Kevin Vermeer Jan 3 '12 at 21:34

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