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What is a non-capturing group in regular expressions?
...s use this dumb regex over it:
\b(\S)(\S)(\S)(\S*)\b
This regex matches words with at least 3 characters, and uses groups to separate the first three letters. The result is this:
Match "Lorem"
Group 1: "L"
Group 2: "o"
Group 3: "r"
Group 4: "em"
Match "ipsum"
Group 1: "i...
if arguments is equal to this string, define a variable like this string
...l to z* (literal matching).
if [ $a == z* ]; then # File globbing and word splitting take place.
if [ "$a" == "z*" ]; then # True if $a is equal to z* (literal matching).
I hope that helps!
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Why is using “for…in” for array iteration a bad idea?
...efined
3: undefined
4: undefined
5: xyz
for...in:
0: 5
1: foo
In other words:
for...of counts from 0 to 5, and also ignores Array.prototype.foo. It shows array values.
for...in lists only the 5, ignoring undefined array indexes, but adding foo. It shows array property
How do I prevent 'git diff' from using a pager?
... pager for git diff" (see the comments).
But the documentation just got reworded (for git 1.8.5 or 1.9, Q4 2013).
Text viewer for use by Git commands (e.g., 'less').
The value is meant to be interpreted by the shell.
The order of preference is:
the $GIT_PAGER environment vari...
Find method references in Xcode
.... Make sure no text gets selected otherwise it'll search for the selected word rather than the entire selector. To do so, you can click with the left mouse button prior to clicking with the right mouse button (or Control-clicking) in the same location. There's no such issue with the contextual Fi...
Why was the switch statement designed to need a break?
...cases. Fall through
occurs in just 3% of all these cases.
In other words, the normal switch
behavior is wrong 97% of the time.
It's not just in a compiler - on the
contrary, where fall through was used
in this analysis it was often for
situations that occur more frequently
in a c...
What's the difference between OpenID and OAuth?
...ey have.
OAuth was created to remove the need for users to share their passwords with third-party applications. It actually started as a way to solve an OpenID problem: if you support OpenID on your site, you can't use HTTP Basic credentials (username and password) to provide an API because the user...
Proper use of 'yield return'
The yield keyword is one of those keywords in C# that continues to mystify me, and I've never been confident that I'm using it correctly.
...
RequestDispatcher.forward() vs HttpServletResponse.sendRedirect()
... F5 or navigating back in history).
User user = userDAO.find(username, password);
if (user != null) {
request.getSession().setAttribute("user", user); // Login user.
response.sendRedirect("home"); // Redirects to http://example.com/context/home after succesful login.
} else {
request.set...
Big-oh vs big-theta [duplicate]
...bout 'matrix multiplication' being O(N^3). Perhaps you should throw in the words 'best known algorithm' in there.
– Aryabhatta
Jul 12 '10 at 16:38
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