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RegEx for Javascript to allow only alphanumeric
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Use the word character class. The following is equivalent to a ^[a-zA-Z0-9_]+$:
^\w+$
Explanation:
^ start of string
\w any word character (A-Z, a-z, 0-9, _).
$ end of string
Use /[^\w]|_/g if you don't want to match the under...
How to Select Columns in Editors (Atom,Notepad++, Kate, VIM, Sublime, Textpad,etc) and IDEs (NetBean
...is is a toggle.
Columnar selection is a mode you enter and leave: in other words, Eclipse switches into a mode where all mouse selections have to be columnar and you stay in that mode until you switch back (by using the same command again).
It's not like other editors where columnar selections are e...
More elegant “ps aux | grep -v grep”
... @kxsong: | grep '[t]erminal' selects any line containing the word 'terminal' without putting the word 'terminal' into the process list. What are you trying to achieve with | grep '[r]oot' and how is it not working? There is likely to be a better solution.
– Johnsy...
How to sort a NSArray alphabetically?
...is more specific.
In English, normally when we alphabetise, we ignore the word "the" at the beginning of a phrase. So "The United States" would be ordered under "U" and not "T".
This does that for you.
It would probably be best to put these in categories.
// Sort an array of NSStrings alphabeti...
Why does (0 < 5 < 3) return true?
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Don't worry about erickson. I misuses the word semantic too. :)
– Mateen Ulhaq
Nov 4 '10 at 22:48
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What do two question marks together mean in C#?
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Just because no-one else has said the magic words yet: it's the null coalescing operator. It's defined in section 7.12 of the C# 3.0 language specification.
It's very handy, particularly because of the way it works when it's used multiple times in an expression. An ex...
How may I align text to the left and text to the right in the same line?
...n on the first, that happens by default. This handles overlap perfectly by word-wrapping.
HTML
<table style="width: 100%;">
<tr><td>Left aligned stuff</td>
<td class="alignRight">Right aligned stuff</td></tr>
</table>
CSS
.alignRight {
f...
SQL JOIN and different types of JOINs
...ve, because contrary to popular belief - a picture is not worth a thousand words. See next answer.
– hyankov
Oct 10 '17 at 8:37
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show 11 mo...
Is there any advantage of using map over unordered_map in case of trivial keys?
... (left/right/parent) plus a color bit which due to alignment takes a forth word. That is four pointers plus data per each element.
– Yakov Galka
Sep 7 '16 at 9:20
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What are the differences between Abstract Factory and Factory design patterns?
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Is your use of the word "Super" in "SuperFoo" just to mean a special case of Foo, or does it actually mean super class? As I assumed it must be a subclass.
– dahui
Sep 14 '16 at 9:01
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