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What special characters must be escaped in regular expressions?
...nds on the regex flavor you're working with.
For PCRE, and most other so-called Perl-compatible flavors, escape these outside character classes:
.^$*+?()[{\|
and these inside character classes:
^-]\
For POSIX extended regexes (ERE), escape these outside character classes (same as PCRE):
.^$*...
Go naming conventions for const
...your const element exposed to other packages. If you use UpperCamelCase or ALL_CAPS you'll be exporting it outside of your package. For this reason, I stick to lowerCamelCase for private const variables, and I recall reading this recommendation from someone relatively close to the Go project (or per...
When should I use Debug.Assert()?
...s for a while in C++ and C, but had no idea they existed in C# and .NET at all until recently.
20 Answers
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Representing null in JSON
...s of type undefined.
JSON2 {"myCount": null}
In this case, myCount is actually defined, albeit its value is null. This is not the same as both "not undefined and not null", and if you were testing for one condition or the other, this might succeed whereas JSON1 would fail.
This is the definitive wa...
REST API Token-based Authentication
...e over HTTP, I reasoned that we would dispense tokens to avoid repeatedly calling the authentication service. Which brings me neatly to my first question:
...
Is “for(;;)” faster than “while (TRUE)”? If not, why do people use it?
...
It's not faster.
If you really care, compile with assembler output for your platform and look to see.
It doesn't matter. This never matters. Write your infinite loops however you like.
...
entity object cannot be referenced by multiple instances of IEntityChangeTracker. while adding relat
... I might be missing something here, but in some ORMs (especially EntityFramework) the data context should always be shortlived. Introducing a static or re-used context will introduce a whole other set of challenges and problems.
– Maritim
Oct 13 ...
Calculate MD5 checksum for a file
... {
return md5.ComputeHash(stream);
}
}
(I believe that actually the MD5 implementation used doesn't need to be disposed, but I'd probably still do so anyway.)
How you compare the results afterwards is up to you; you can convert the byte array to base64 for example, or compare the by...
Find kth smallest element in a binary search tree in Optimum way
I need to find the kth smallest element in the binary search tree without using any static/global variable. How to achieve it efficiently?
The solution that I have in my mind is doing the operation in O(n), the worst case since I am planning to do an inorder traversal of the entire tree. But deep do...
What is a “Bitmap heap scan” in a query plan?
... stay in memory, but you get the point).
A bitmap index scan will sequentially open a short-list of disk pages, and grab every applicable row in each one (hence the so-called recheck cond you see in query plans).
Note, as an aside, how clustering/row order affects the associated costs with either ...