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sed error: “invalid reference \1 on `s' command's RHS”

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How long is the SHA256 hash?

... 346 A sha256 is 256 bits long -- as its name indicates. Since sha256 returns a hexadecimal represe...
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SQL Group By with an Order By

... answered Aug 27 '08 at 15:46 Scott NoyesScott Noyes 2,11611 gold badge1212 silver badges33 bronze badges ...
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Create empty queryset by default in django form fields

... 432 You can have an empty queryset by doing this: MyModel.objects.none() Although i don't know ...
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Jump to matching XML tags in Vim

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SELECT INTO using Oracle

... | edited Dec 9 '19 at 10:48 answered Feb 12 '10 at 7:22 AP...
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How do I detect what .NET Framework versions and service packs are installed?

...5 1.1 HKLM\Software\Microsoft\NET Framework Setup\NDP\v1.1.4322\Install 2.0 HKLM\Software\Microsoft\NET Framework Setup\NDP\v2.0.50727\Install 3.0 HKLM\Software\Microsoft\NET Framework Setup\NDP\v3.0\Setup\InstallSuccess 3.5 HKLM\Softwa...
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How does clipsToBounds work?

... answered Dec 8 '13 at 3:14 nhgrifnhgrif 56.4k2222 gold badges119119 silver badges160160 bronze badges ...
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How do I calculate the normal vector of a line segment?

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Performing regex Queries with pymongo

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