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Validating IPv4 addresses with regexp
...aptured either way if we didn't have a full-match in the first place.
Old and shorter version (less readable) (63 chars)
^(?:(25[0-5]|2[0-4][0-9]|1[0-9]{2}|[1-9]?[0-9])(\.(?!$)|$)){4}$
Older (readable) version (70 chars)
^(?:(25[0-5]|2[0-4][0-9]|1[0-9][0-9]|[1-9][0-9]|[0-9])(\.(?!$)|$)){4}$
It ...
Add and remove multiple classes in jQuery
I'm trying to add and remove multiple classes on a text field by clicking different radio buttons. I'm not able to remove the unwanted classes while switching between different radio buttons.
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Why are trailing commas allowed in a list?
I am curious why in Python a trailing comma in a list is valid syntax, and it seems that Python simply ignores it:
5 Answer...
Rails respond_with: how does it work?
I've been reading here and there about how cool the respond_with method is in Rails 3. But I can't even find a reference to it in either the Rails APIs or by searching the source. Can anyone either explain to me how it works (what options you can use, etc) or point me to the place it's actually im...
How to keep up with the latest versions of Node.js in Ubuntu? PPA? Compiling?
... could also use tools like for example nvm which can help you install node and even have multiple versions.
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Master-master vs master-slave database architecture?
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We're trading off availability, consistency and complexity. To address the last question first: Does this matter? Yes very much! The choices concerning how your data is to be managed is absolutely fundamental, and there's no "Best Practice" dodging the decisions. You n...
Grep regex NOT containing string
...p to check against a syslog file. They are usually matching an IP address and log entry;
3 Answers
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How to read the Stock CPU Usage data
On Ice Cream Sandwich, an option in the Developer Options is "Show CPU Usage", which adds an overlay on the screen (see screenshot below).
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Function return value in PowerShell
...ere are two main ideas to wrap your head around:
All output is captured, and returned
The return keyword really just indicates a logical exit point
Thus, the following two script blocks will do effectively the exact same thing:
$a = "Hello, World"
return $a
$a = "Hello, World"
$a
return
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How do I kill background processes / jobs when my shell script exits?
... kill $(jobs -p) doesn't work in dash, because it executes command substitution in a subshell (see Command Substitution in man dash)
– user1431317
Jun 15 '17 at 13:37
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