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Regex to check whether a string contains only numbers [duplicate]
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This one will allow also for signed and float numbers or empty string:
var reg = /^-?\d*\.?\d*$/
If you don't want allow to empty string use this one:
var reg = /^-?\d+\.?\d*$/
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How do I programmatically determine operating system in Java?
...e operating system of the host that my Java program is running programmatically (for example: I would like to be able to load different properties based on whether I am on a Windows or Unix platform). What is the safest way to do this with 100% reliability?
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How to find out how many lines of code there are in an Xcode project?
...loc-1.56.pl' command. If your source code is located in directory 'project_code' You just need to run following command.
– JZ.
Sep 26 '14 at 3:41
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What are “Groovy” and “Grails” and what kinds of applications are built using them?
...eb framework, it can successfully be used to develop lightweight REST microservices, without the footprint of a templating engine, or even an ORM layer. grails.github.io/grails-doc/latest/guide/single.html#profiles
– Luis Muñiz
Nov 19 '15 at 22:30
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Algorithm to compare two images
.../04/97.jpg) has gone bad. Note that stackoverflow now has an image hosting service.
– ThomasW
Nov 17 '11 at 0:49
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What command opens Ruby's REPL?
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Check if an image is loaded (no errors) with jQuery
...e you risk that the image might load (or encounter an error) before those callbacks are added, and they won't be called.
– callum
Feb 7 '12 at 11:32
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List View Filter Android
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How do I add indices to MySQL tables?
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ALTER TABLE `table` ADD INDEX `product_id_index` (`product_id`)
Never compare integer to strings in MySQL. If id is int, remove the quotes.
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How set the default repository
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