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How to check if a string contains only digits in Java [duplicate]
...+";
or
String regex = "\\d+";
As per Java regular expressions, the + means "one or more times" and \d means "a digit".
Note: the "double backslash" is an escape sequence to get a single backslash - therefore, \\d in a java String gives you the actual result: \d
References:
Java Regular Exp...
How can I detect whether an iframe is loaded?
...s.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<button id='click'>click me</button>
<iframe style="display:none" id='MainPopupIframe' src='' /></iframe>
jsfiddle DEMO.
Update: Using plain javascript
window.onload=function(){
var ifr=docum...
Flask-SQLAlchemy how to delete all rows in a single table
... Does not work if you use a query like this: Model.query.filter(Model.some_id == some_id, Model.other_id.in_(other_ids).delete()
– swade
Jan 26 '17 at 19:27
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What is the purpose of Looper and how to use it?
...
How to quit a loop. I mean where to include Looper.quit() in the above code example?
– Seenu69
Oct 17 '13 at 11:37
7
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Making macOS Installer Packages which are Developer ID ready
...HelloWorldAppComponents.plist" \
--scripts "./Package/Scripts" \
--identifier "com.test.pkg.HelloWorld" \
--version "$VERSION" \
--install-location "/" \
"${BUILT_PRODUCTS_DIR}/HelloWorld.pkg"
pkgbuild --root "${BUILT_PRODUCTS_DIR}/Helper.app" \
--component-plist "./Package/H...
API vs. Webservice [closed]
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An API (Application Programming Interface) is the means by which third parties can write code that interfaces with other code. A Web Service is a type of API, one that almost always operates over HTTP (though some, like SOAP, can use alternate transports, like SMTP). The off...
Understanding the difference between __getattr__ and __getattribute__
...“Python”); we’re just getting whatever __getattribute__ returned. It means that we’ve virtually lost the value attribute; it has become “unreachable”.
share
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improve this answer
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Returning a boolean from a Bash function
...ng a 250+ upvote answer
It's not that 0 = true and 1 = false. It is: zero means no failure (success) and non-zero means failure (of type N).
While the selected answer is technically "true" please do not put return 1** in your code for false. It will have several unfortunate side effects.
Experi...
What is Common Gateway Interface (CGI)?
...ot all, webservers can be configured to execute a program as a 'CGI'. This means that the webserver, upon receiving a request, will forward the data to a specific program, setting some environment variables and marshalling the parameters via standard input and standard output so the program can know...
What is the difference between JSON and Object Literal Notation?
...define such a structure.
Such formats are typically language-independent, meaning they can be processed by Java, Python, JavaScript, PHP, you name it.
In contrast, JavaScript is a programming language. Of course JavaScript also provides a way to define/describe data, but the syntax is very specifi...