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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Is it obvious that string-match syntax matching is
	affected	by	the current buffer?
Date: Sun, 13 Mar 2016 21:36:24 +0200
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> From: Tom <adatgyujto@gmail.com>
> Date: Sun, 13 Mar 2016 19:19:09 +0000 (UTC)
> 
> When I work with a string then I feel it should not be affected
> by settings of the current buffer, because it's not buffer text
> anymore, but a separate object.

Yes.  But many times, the string is a substring created from (some
transformation of) the current buffer's text, in which case applying
the buffer's defaults to it yields the expected results.