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Async Procedures 拓展：异步任务拓展，异步处理耗时任务 - App Inventor 2...
...r(--secondary)]Capture[color=var(--secondary-high)]420×200 7.07 KB
https://community.kodular.io/t/f ... res-extension/21322
高级异步拓展：Enhanced Asynchronous Task Extension
https://community.kodular.io/t/f ... sk-extension/253314
Capturing Groups From a Grep RegEx
...he following examples and more, which may not be what you're looking for:
123_abc_d4e5
xyz123_abc_d4e5
123_abc_d4e5.xyz
xyz123_abc_d4e5.xyz
To eliminate the second and fourth examples, make your regex like this:
^[0-9]+_([a-z]+)_[0-9a-z]*
which says the string must start with one or more digit...
How to use JavaScript regex over multiple lines?
...elease of ECMA2018 we can now use the s flag to cause . to match '\n', see https://stackoverflow.com/a/36006948/141801
Thus:
let s = 'I am a string\nover several\nlines.';
console.log('String: "' + s + '".');
let r = /string.*several.*lines/s; // Note 's' modifier
console.log('Match? ' + r.test(s...
Using git repository as a database backend
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
How to sort a dataframe by multiple column(s)
...
You can use the order() function directly without resorting to add-on tools -- see this simpler answer which uses a trick right from the top of the example(order) code:
R> dd[with(dd, order(-z, b)), ]
b x y z
4 Low C 9 2
2 Med D 3 1
1 Hi A ...
Difference between UIViewContentModeScaleAspectFit and UIViewContentModeScaleToFill?
...eUploader: {
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WebSockets vs. Server-Sent events/EventSource
...to note:
I have had issues with websockets and corporate firewalls. (Using HTTPS helps but not always.)
See https://github.com/LearnBoost/socket.io/wiki/Socket.IO-and-firewall-software
https://github.com/sockjs/sockjs-client/issues/94
I assume there aren't as many issues with Server-Sent Events. B...
ruby send method passing multiple parameters
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
Best ways to teach a beginner to program? [closed]
... helps.
1) FizzBuzz. Start with command line programs. You can write some fun games, or tools, very quickly, and you learn all of the language features very quickly without having to learn the GUI tools first. These early apps should be simple enough that you won't need to use any real debugging to...
Decimal number regular expression, where digit after decimal is optional
...pace & comments in regular expression)
For example, it will match:
123
23.45
34.
.45
-123
-273.15
-42.
-.45
+516
+9.8
+2.
+.5
And will reject these non-numbers:
. (single decimal point)
-. (negative decimal point)
+. (plus decimal point)
(empty string)
The simpler solutions can incorre...